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106-543: August Raspet (24 August 1913 – 27 April 1960) was an American aerodynamicist and researcher. He was one of the most influential contributors to the science of aeronautics , dealing primarily with efficiency in flight, aerodynamics and wing design structures. His contributions to the field of flight science are many, having published over forty scholarly articles on subjects ranging from human muscle-powered flight to sailplane performance analysis as it relates to airplanes. An avid bird watcher, Raspet developed his dedication to

212-479: A 15-year-old son named Marco. In contrast to the general consensus, there are theories suggesting that Marco Polo's birthplace was the island of Korčula or Constantinople but such hypotheses failed to gain acceptance among most scholars and have been countered by other studies. He was nicknamed Milione during his lifetime (which in Italian literally means 'Million'). The Italian title of his book

318-619: A certain Marco Polo, who in 1300 was mentioned with riots against the aristocratic government, and escaped the death penalty, as well as riots from 1310 led by Bajamonte Tiepolo and Marco Querini, among whose rebels were Jacobello and Francesco Polo from another family branch, is unclear. Polo is clearly mentioned again after 1305 in Maffeo's testament from 1309 to 1310, in a 1319 document according to which he became owner of some estates of his deceased father, and in 1321, when he bought part of

424-537: A detailed account of his travels to a fellow inmate, Rustichello da Pisa , who incorporated tales of his own as well as other collected anecdotes and current affairs from China. The book soon spread throughout Europe in manuscript form, and became known as The Travels of Marco Polo ( Italian title: Il Milione , lit. "The Million", deriving from Polo's nickname "Milione". Original title in Franco-Italian  : Livres des Merveilles du Monde ). It depicts

530-530: A direct Chinese transliteration of the name "Marco" ignores the possibility of his taking on a Chinese or even Mongol name with no similarity to his Latin name . Also in reply to Wood, Jørgen Jensen recalled the meeting of Marco Polo and Pietro d'Abano in the late 13th century. During this meeting, Marco gave to Pietro details of the astronomical observations he had made on his journey. These observations are compatible with Marco's stay in China, Sumatra and

636-409: A gallery around the base of the balloon rather than the hanging basket of the first, unmanned design, which brought the paper closer to the fire. On their free flight, De Rozier and d'Arlandes took buckets of water and sponges to douse these fires as they arose. On the other hand, the manned design of Charles was essentially modern. As a result of these exploits, the hot air balloon became known as

742-435: A given weight by the application of power to the resistance of air." He identified the four vector forces that influence an aircraft: thrust , lift , drag and weight and distinguished stability and control in his designs. He developed the modern conventional form of the fixed-wing aeroplane having a stabilising tail with both horizontal and vertical surfaces, flying gliders both unmanned and manned. He introduced

848-482: A perilous one—of the six hundred people (not including the crew) in the convoy only eighteen had survived (including all three Polos). The Polos left the wedding party after reaching Hormuz and travelled overland to the port of Trebizond on the Black Sea , the present-day Trabzon . The British scholar Ronald Latham has pointed out that The Book of Marvels was a collaboration written in 1298–1299 between Polo and

954-574: A portion of his estate; he approved of this and ordered that a further sum be paid to the convent of San Lorenzo , the place where he wished to be buried. He also set free Peter, a Tartar servant , who may have accompanied him from Asia, and to whom Polo bequeathed 100 lire of Venetian denari. He divided up the rest of his assets, including several properties, among individuals, religious institutions, and every guild and fraternity to which he belonged. He also wrote off multiple debts including 300 lire that his sister-in-law owed him, and others for

1060-513: A potential wife, and they asked the Polos to accompany them, so they were permitted to return to Persia with the wedding party—which left that same year from Zaitun in southern China on a fleet of 14 junks . The party sailed to the port of Singapore , travelled north to Sumatra , and around the southern tip of India, eventually crossing the Arabian Sea to Hormuz . The two-year voyage was

1166-662: A professional writer of romances, Rustichello of Pisa. It is believed that Polo related his memoirs orally to Rustichello da Pisa while both were prisoners of the Genova Republic . Rustichello wrote Devisement du Monde in Franco-Venetian language , which was a literary-only language widespread in northern Italy between the subalpine belt and the lower Po between the 13th and 15th centuries. Latham also argued that Rustichello may have glamorised Polo's accounts, and added fantastic and romantic elements that made

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1272-485: A similar demonstration of a hydrogen balloon. Charles and two craftsmen, the Robert brothers, developed a gas-tight material of rubberised silk for the envelope. The hydrogen gas was to be generated by chemical reaction during the filling process. The Montgolfier designs had several shortcomings, not least the need for dry weather and a tendency for sparks from the fire to set light to the paper balloon. The manned design had

1378-577: A trading voyage before Marco's birth. In 1260, Niccolò and Maffeo, while residing in Constantinople, then the capital of the Latin Empire , foresaw a political change; they liquidated their assets into jewels and moved away. According to The Travels of Marco Polo , they passed through much of Asia, and met with Kublai Khan , a Mongol ruler and founder of the Yuan dynasty . Almost nothing

1484-579: A venture, the Polo family probably invested profits from trading, and even many gemstones they brought from the East. The company continued its activities and Marco soon became a wealthy merchant. Marco and his uncle Maffeo financed other expeditions, but likely never left Venetian provinces, nor returned to the Silk Road and Asia. Sometime before 1300, his father Niccolò died. In 1300, he married Donata Badoèr,

1590-426: Is a branch of dynamics called aerodynamics , which deals with the motion of air and the way that it interacts with objects in motion, such as an aircraft. Attempts to fly without any real aeronautical understanding have been made from the earliest times, typically by constructing wings and jumping from a tower with crippling or lethal results. Wiser investigators sought to gain some rational understanding through

1696-682: Is also largely free of the gross errors found in other accounts such as those given by the Moroccan traveller Ibn Battuta who had confused the Yellow River with the Grand Canal and other waterways, and believed that porcelain was made from coal. Modern studies have further shown that details given in Marco Polo's book, such as the currencies used, salt productions and revenues, are accurate and unique. Such detailed descriptions are not found in other non-Chinese sources, and their accuracy

1802-577: Is based on a Latin manuscript found in the library of the Cathedral of Toledo in 1932, and is 50% longer than other versions. The popular translation published by Penguin Books in 1958 by R. E. Latham works several texts together to make a readable whole. Sharon Kinoshita 's 2016 version takes as its source the Franco-Italian 'F' manuscript, and invites readers to "focus on the text as

1908-607: Is considered to be the first air plane in series production, making the Maschinenfabrik Otto Lilienthal in Berlin the first air plane production company in the world. Otto Lilienthal is often referred to as either the "father of aviation" or "father of flight". Other important investigators included Horatio Phillips . Aeronautics may be divided into three main branches, Aviation , Aeronautical science and Aeronautical engineering . Aviation

2014-418: Is formed entirely from propellants carried within the rocket before use. Rocket engines work by action and reaction . Rocket engines push rockets forwards simply by throwing their exhaust backwards extremely fast. Rockets for military and recreational uses date back to at least 13th-century China . Significant scientific, interplanetary and industrial use did not occur until the 20th century, when rocketry

2120-568: Is inaccurate), no other foreign visitors to Yuan China mentioned the practice, perhaps an indication that the footbinding was not widespread or was not practised in an extreme form at that time. Marco Polo himself noted (in the Toledo manuscript) the dainty walk of Chinese women who took very short steps. It has also been noted by other scholars that many of the things not mentioned by Marco Polo such as tea and chopsticks were not mentioned by other travellers either. Haw also pointed out that despite

2226-581: Is known about the childhood of Marco Polo until he was fifteen years old, except that he probably spent part of his childhood in Venice. Meanwhile, Marco Polo's mother died, and an aunt and uncle raised him. He received a good education, learning mercantile subjects including foreign currency, appraising, and the handling of cargo ships; he learned little or no Latin . His father later married Floradise Polo (née Trevisan). In 1269, Niccolò and Maffeo returned to their families in Venice, meeting young Marco for

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2332-559: Is nothing in The Book of Marvels about China that could not have been obtained by reading Persian books. Wood maintains that it is more probable that Polo went only to Constantinople (modern Istanbul, Turkey) and some of the Italian merchant colonies around the Black Sea, picking hearsay from those travellers who had been farther east. Supporters of Polo's basic accuracy countered on the points raised by sceptics such as footbinding and

2438-455: Is supported by archaeological evidence as well as Chinese records compiled after Polo had left China. His accounts are therefore unlikely to have been obtained second hand. Other accounts have also been verified; for example, when visiting Zhenjiang in Jiangsu , China, Marco Polo noted that a large number of Christian churches had been built there. His claim is confirmed by a Chinese text of

2544-575: Is the Elizabethan version by John Frampton published in 1579, The most noble and famous travels of Marco Polo , based on Santaella's Castilian translation of 1503 (the first version in that language). The published editions of Polo's book rely on single manuscripts, blend multiple versions together, or add notes to clarify, for example in the English translation by Henry Yule . The 1938 English translation by A. C. Moule and Paul Pelliot

2650-421: Is the art or practice of aeronautics. Historically aviation meant only heavier-than-air flight, but nowadays it includes flying in balloons and airships. Aeronautical engineering covers the design and construction of aircraft, including how they are powered, how they are used and how they are controlled for safe operation. A major part of aeronautical engineering is aerodynamics , the science of passing through

2756-496: Is unknown, but scholars estimate it to be between 1271 and 1275. On reaching the Yuan court, the Polos presented the sacred oil from Jerusalem and the papal letters to their patron. Marco knew four languages, and the family had accumulated a great deal of knowledge and experience that was useful to Kublai. It is possible that he became a government official; he wrote about many imperial visits to China's southern and eastern provinces,

2862-685: The Catalan Atlas and the Fra Mauro map . Marco Polo was born around 1254 in Venice , but the exact date and place of birth are archivally unknown. The Travels of Marco Polo contains some basic information concerning Marco Polo's Venetian family and his birth in Venice; the book states that Marco's father, the travelling merchant Niccolò Polo , returned to visit his family in his hometown of Venice around 1269 and there found out that his wife, whom he had left pregnant, had died and left

2968-487: The Genova Republic . Rustichello wrote Devisement du Monde in Franco-Venetian . The idea probably was to create a handbook for merchants , essentially a text on weights, measures and distances. The oldest surviving manuscript is in Old French heavily flavoured with Italian; According to the Italian scholar Luigi Foscolo Benedetto, this "F" text is the basic original text, which he corrected by comparing it with

3074-535: The Mongol Empire and China under the Yuan dynasty , giving Europeans their first comprehensive look into China, Persia, India, Japan, and other Asian societies. Born in Venice , Marco learned the mercantile trade from his father and his uncle, Niccolò and Maffeo , who travelled through Asia and met Kublai Khan . In 1269, they returned to Venice to meet Marco for the first time. The three of them embarked on an epic journey to Asia, exploring many places along

3180-553: The Montgolfière type and the gas balloon the Charlière . Charles and the Robert brothers' next balloon, La Caroline , was a Charlière that followed Jean Baptiste Meusnier 's proposals for an elongated dirigible balloon, and was notable for having an outer envelope with the gas contained in a second, inner ballonet. On 19 September 1784, it completed the first flight of over 100 km, between Paris and Beuvry , despite

3286-698: The South China Sea and are recorded in Pietro's book Conciliator Differentiarum , but not in Marco's Book of Travels . Reviewing Haw's book, Peter Jackson (author of The Mongols and the West ) has said that Haw "must surely now have settled the controversy surrounding the historicity of Polo's visit to China". Igor de Rachewiltz's review, which refutes Wood's points, concludes with a strongly-worded condemnation: "I regret to say that F. W.'s book falls short of

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3392-448: The 'marvellous' fables and legends given in other European accounts, and despite some exaggerations and errors, Polo's accounts have relatively few of the descriptions of irrational marvels. In many cases of descriptions of events where he was not present (mostly given in the first part before he reached China, such as mentions of Christian miracles), he made a clear distinction that they are what he had heard rather than what he had seen. It

3498-587: The 14th century explaining how a Sogdian named Mar-Sargis from Samarkand founded six Nestorian Christian churches there in addition to one in Hangzhou during the second half of the 13th century. His story of the princess Kököchin sent from China to Persia to marry the Īl-khān is also confirmed by independent sources in both Persia and China. Sceptics have long wondered whether Marco Polo wrote his book based on hearsay, with some pointing to omissions about noteworthy practices and structures of China as well as

3604-406: The 17th century with Galileo 's experiments in which he showed that air has weight. Around 1650 Cyrano de Bergerac wrote some fantasy novels in which he described the principle of ascent using a substance (dew) he supposed to be lighter than air, and descending by releasing a controlled amount of the substance. Francesco Lana de Terzi measured the pressure of air at sea level and in 1670 proposed

3710-528: The Chinese techniques then current. The Chinese also constructed small hot air balloons, or lanterns, and rotary-wing toys. An early European to provide any scientific discussion of flight was Roger Bacon , who described principles of operation for the lighter-than-air balloon and the flapping-wing ornithopter , which he envisaged would be constructed in the future. The lifting medium for his balloon would be an "aether" whose composition he did not know. In

3816-722: The Civil Service. He received an MS degree in Physics in 1940 and PhD in 1942. His PhD dissertation covered instruments for measuring Earth's magnetic fields. In 1942 he began as a research physicist for the Gould Aeronautical Division of Pratt Read and Co. in Deep River, Connecticut. In 1943 he became a research physicist at Specialties, Inc. in Syosset, New York. While at Specialties, Inc. he became

3922-759: The Director of Research of the Soaring Society of America (The August 1960 edition of its monthly magazine is entirely dedicated to Raspet) for the glider phase of Project Thunderstorm. In 1947 Raspet became President and Director of Research at the Aerophysic Institute, Inc. for their study of airflow over an extended ridge, funded by the US Office of Naval Research . In 1949 Raspet became the Sailplane Projects Leader for

4028-632: The Dr. August Raspet Memorial Award to a person or group who has made significant advancements in the field of light aircraft design. "The first recipient of the award was John Thorp, Lockheed engineer on the Little Dipper and Big Dipper , and designer of the Thorp Aviation Sky Skooter . Since then the list of people honored reads like a Who's Who of aircraft design." Aeronautics A significant part of aeronautical science

4134-614: The Engineering Station at Mississippi State College . From 1953 until his untimely death in 1960, he served as Head of the Aerophysics Department at Mississippi State College (now Mississippi State University). The Flight Research Laboratory at MSU is named for him. On 27 April 1960, Raspet was involved in a plane crash during a demonstration of a Piper Cub with boundary layer modifications at Starkville, Mississippi 's George M. Bryan Airport . He died at

4240-464: The Europeans with a clear picture of the East's geography and ethnic customs, and it included the first Western record of porcelain, gunpowder, paper money, and some Asian plants and exotic animals. His narrative inspired Christopher Columbus and many other travellers. There is substantial literature based on Polo's writings; he also influenced European cartography , leading to the introduction of

4346-710: The Great Wall of China. Historian Stephen G. Haw argued that the Great Walls were built to keep out northern invaders, whereas the ruling dynasty during Marco Polo's visit were those very northern invaders. They note that the Great Wall familiar to us today is a Ming structure built some two centuries after Marco Polo's travels; and that the Mongol rulers whom Polo served controlled territories both north and south of today's wall, and would have had no reasons to maintain any fortifications that might have remained there from

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4452-525: The Indies ), it is reasonable to think that they considered Marco's book as a trustworthy piece of information for missions in the East. The diplomatic communications between Pope Innocent IV and Pope Gregory X with the Mongols were probably another reason for this endorsement. At the time, there was open discussion of a possible Christian-Mongol alliance with an anti-Islamic function. A Mongol delegate

4558-489: The Mongols as ' barbarians ' who appeared to belong to 'some other world'. Doubts have also been raised in later centuries about Marco Polo's narrative of his travels in China, for example for his failure to mention the Great Wall of China , and in particular the difficulties in identifying many of the place names he used (the great majority, however, have since been identified). Many have questioned whether he had visited

4664-470: The Polos joined a caravan of travelling merchants whom they crossed paths with. Unfortunately, the party was soon attacked by bandits , who used the cover of a sandstorm to ambush them. The Polos managed to fight and escape through a nearby town, but many members of the caravan were killed or enslaved. Three and a half years after leaving Venice, when Marco was about 21 years old, the Polos were welcomed by Kublai into his palace. The exact date of their arrival

4770-736: The Polos with his last duty: accompany the Mongol princess Kököchin , who was to become the consort of Arghun Khan , in Persia. When the Polos arrived to Persia, they learned that Arghun Khan died, and Kököchin eventually became a wife of his son Ghazan . After leaving the princess, the Polos travelled overland to Constantinople. They later decided to return to their home. They returned to Venice in 1295, after 24 years, with many riches and treasures. They had travelled almost 15,000 miles (24,000 km). Marco Polo returned to Venice in 1295 with his fortune converted into gemstones . At this time, Venice

4876-520: The Polos' journeys throughout Asia, giving Europeans their first comprehensive look into the inner workings of the Far East , including China, India, and Japan . Polo was finally released from captivity in August 1299, and returned home to Venice, where his father and uncle in the meantime had purchased a large palazzo in the zone named contrada San Giovanni Crisostomo (Corte del Milion). For such

4982-516: The Silk Road until they reached " Cathay ". They were received by the royal court of Kublai Khan, who was impressed by Marco's intelligence and humility. Marco was appointed to serve as Kublai's foreign emissary, and he was sent on many diplomatic missions throughout the empire and Southeast Asia, visiting present-day Burma, India, Indonesia, Sri Lanka, and Vietnam. As part of this appointment, Marco also travelled extensively inside China, living in

5088-511: The air as the air does to the object." ( Newton would not publish the Third law of motion until 1687.) His analysis led to the realisation that manpower alone was not sufficient for sustained flight, and his later designs included a mechanical power source such as a spring. Da Vinci's work was lost after his death and did not reappear until it had been overtaken by the work of George Cayley . The modern era of lighter-than-air flight began early in

5194-405: The air becomes compressed, typically at speeds above Mach 1. Transonic flow occurs in the intermediate speed range around Mach 1, where the airflow over an object may be locally subsonic at one point and locally supersonic at another. A rocket or rocket vehicle is a missile , spacecraft, aircraft or other vehicle which obtains thrust from a rocket engine . In all rockets, the exhaust

5300-544: The air. With the increasing activity in space flight, nowadays aeronautics and astronautics are often combined as aerospace engineering . The science of aerodynamics deals with the motion of air and the way that it interacts with objects in motion, such as an aircraft. The study of aerodynamics falls broadly into three areas: Incompressible flow occurs where the air simply moves to avoid objects, typically at subsonic speeds below that of sound (Mach 1). Compressible flow occurs where shock waves appear at points where

5406-442: The book a bestseller. The Italian scholar Luigi Foscolo Benedetto had previously demonstrated that the book was written in the same "leisurely, conversational style" that characterised Rustichello's other works, and that some passages in the book were taken verbatim or with minimal modifications from other writings by Rustichello. For example, the opening introduction in The Book of Marvels to "emperors and kings, dukes and marquises"

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5512-502: The book that would convince him that Marco Polo did not go to China. Haw also argues in his book Marco Polo's China that Marco's account is much more correct and accurate than has often been supposed and that it is extremely unlikely that he could have obtained all the information in his book from secondhand sources. Haw also criticizes Wood's approach to finding mention of Marco Polo in Chinese texts by contending that contemporaneous Europeans had little regard for using surnames and that

5618-534: The convent of San Giovanni , San Paolo of the Order of Preachers , and a cleric named Friar Benvenuto. He ordered 220  soldi be paid to Giovanni Giustiniani for his work as a notary and his prayers. The will was not signed by Polo, but was validated by the then-relevant " signum manus " rule, by which the testator had only to touch the document to make it legally valid. Due to the Venetian law stating that

5724-498: The daughter of Vitale Badoèr, a merchant. They had three daughters, Fantina (married Marco Bragadin), Bellela (married Bertuccio Querini), and Moreta. In 2022, it was found that Polo first had a daughter named Agnese (b. 1295/1299 - d. 1319) from a partnership or marriage which ended before 1300. Pietro d'Abano , a philosopher, doctor and astrologer based in Padua , reports having spoken with Marco Polo about what he had observed in

5830-466: The day ends at sunset, the exact date of Marco Polo's death cannot be determined, but according to some scholars it was between the sunsets of 8 and 9 January 1324. Biblioteca Marciana , which holds the original copy of his testament, dates the testament on 9 January 1323, and gives the date of his death at some time in June 1324. An authoritative version of Marco Polo's book does not and cannot exist, for

5936-597: The drawing in his volume Conciliator Differentiarum, quæ inter Philosophos et Medicos Versantur . Marco Polo gave Pietro other astronomical observations he made in the Southern Hemisphere , and also a description of the Sumatran rhinoceros , which are collected in the Conciliator . In 1305 he is mentioned in a Venetian document among local sea captains regarding the payment of taxes. His relation with

6042-405: The earlier dynasties. Other Europeans who travelled to Khanbaliq during the Yuan dynasty, such as Giovanni de' Marignolli and Odoric of Pordenone , said nothing about the wall either. The Muslim traveller Ibn Battuta , who asked about the wall when he visited China during the Yuan dynasty, could find no one who either had seen it or knew of anyone who had seen it, suggesting that while ruins of

6148-445: The early manuscripts differ significantly, and the reconstruction of the original text is a matter of textual criticism . A total of about 150 copies in various languages are known to exist. Before the availability of printing press , errors were frequently made during copying and translating, so there are many differences between the various copies. Polo related his memoirs orally to Rustichello da Pisa while both were prisoners of

6254-429: The emperor's lands for 17 years and seeing many things previously unknown to Europeans. Around 1291, the Polos offered to accompany the Mongol princess Kököchin to Persia; they arrived there around 1293. After leaving the princess, they travelled overland to Constantinople and then to Venice, returning home after 24 years. At this time, Venice was at war with Genoa . Marco joined the war effort on behalf of Venice and

6360-601: The established view that Polo was in China, in response to Wood's book. The book has been criticized by figures including Igor de Rachewiltz (translator and annotator of The Secret History of the Mongols ) and Morris Rossabi (author of Kublai Khan: his life and times ). The historian David Morgan points out basic errors made in Wood's book such as confusing the Liao dynasty with the Jin dynasty , and he found no compelling evidence in

6466-471: The evidence supporting Marco Polo's credibility." Some scholars believe that Marco Polo exaggerated his importance in China. The British historian David Morgan thought that Polo had likely exaggerated and lied about his status in China, while Ronald Latham believed that such exaggerations were embellishments by his ghostwriter Rustichello da Pisa . Et meser Marc Pol meisme, celui de cui trate ceste livre, seingneurie ceste cité por trois anz. And

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6572-400: The family property of his wife Donata. In 1323, Polo was confined to bed due to illness. On 8 January 1324, despite physicians' efforts to treat him, Polo was on his deathbed. To write and certify the will, his family requested Giovanni Giustiniani, a priest of San Procolo. His wife, Donata, and his three daughters were appointed by him as co-executrices . The church was entitled by law to

6678-492: The far south and Burma . They were highly respected and sought after in the Mongolian court, and so Kublai Khan decided to decline the Polos' requests to leave China. They became worried about returning home safely, believing that if Kublai died, his enemies might turn against them because of their close involvement with the ruler. In 1292, Kublai's great-nephew, then ruler of Persia , sent representatives to China in search of

6784-479: The few omissions, Marco Polo's account is more extensive, more accurate and more detailed than those of other foreign travellers to China in this period. Marco Polo even observed Chinese nautical inventions such as the watertight compartments of bulkhead partitions in Chinese ships , knowledge of which he was keen to share with his fellow Venetians. In addition to Haw, other scholars have argued in favour of

6890-546: The first scientifically credible lifting medium in the form of hollow metal spheres from which all the air had been pumped out. These would be lighter than the displaced air and able to lift an airship . His proposed methods of controlling height are still in use today; by carrying ballast which may be dropped overboard to gain height, and by venting the lifting containers to lose height. In practice de Terzi's spheres would have collapsed under air pressure, and further developments had to wait for more practicable lifting gases. From

6996-591: The first time, at the age of fifteen or sixteen. In 1271, Niccolò, Maffeo and Marco Polo embarked on their voyage to fulfil Kublai's request. They sailed to Acre , and then rode on camels to the Persian port of Hormuz . The Polos wanted to sail straight into China, but the ships there were not seaworthy, so they continued overland through the Silk Road , until reaching Kublai's summer palace in Shangdu , near present-day Zhangjiakou . In one instance during their trip,

7102-572: The first time. In 1271, during the rule of Doge Lorenzo Tiepolo , Marco Polo (at seventeen years of age), his father, and his uncle set off for Asia on the series of adventures that Marco later documented in his book. They sailed to Acre and later rode on their camels to the Persian port Hormuz . During the first stages of the journey, they stayed for a few months in Acre and were able to speak with Archdeacon Tedaldo Visconti of Piacenza . The Polo family, on that occasion, had expressed their regret at

7208-429: The idea of " heavier than air " a reality. Newspapers and magazines published photographs of Lilienthal gliding, favourably influencing public and scientific opinion about the possibility of flying machines becoming practical. His work lead to him developing the concept of the modern wing. His flight attempts in Berlin in the year 1891 are seen as the beginning of human flight and the " Lilienthal Normalsegelapparat "

7314-634: The idea of flight from a young age and would use ideas generated from observing avian flight in his experiments and research throughout his career. Raspet was born in Irwin, Pennsylvania on 24 August 1913. He received a BS degree in Physics in 1935 and began working in the Civil Service as a junior physicist. In 1938 he began graduate studies at the University of Maryland while still working in

7420-481: The lack of details in his description of southern Chinese cities compared to northern ones, while Herbert Franke also raised the possibility that Marco Polo had not been to China at all, and wondered if he had based his accounts on Persian sources, in view of his use of Persian expressions. This is taken further by Frances Wood who claimed in her 1995 book Did Marco Polo Go to China? that at best Polo never went farther east than Persia (modern Iran), and that there

7526-530: The lack of details on some places in his book. While Polo describes paper money and the burning of coal, he fails to mention the Great Wall of China , tea , Chinese characters , chopsticks , or footbinding . His failure to note the presence of the Great Wall of China was first raised in the middle of the 17th century, and in the middle of the 18th century, it was suggested that he had never reached China. Later scholars such as John W. Haeger argued that Marco Polo might not have visited Southern China, in view of

7632-457: The lamp in Jerusalem . The long sede vacante between the death of Pope Clement IV in 1268 and the election of his successor delayed the Polos in fulfilling Kublai's request. They followed the suggestion of Theobald Visconti, then papal legate for the realm of Egypt , and returned to Venice in 1269 or 1270 to await the nomination of the new Pope, which allowed Marco to see his father for

7738-453: The late fifteenth century, Leonardo da Vinci followed up his study of birds with designs for some of the earliest flying machines, including the flapping-wing ornithopter and the rotating-wing helicopter . Although his designs were rational, they were not based on particularly good science. Many of his designs, such as a four-person screw-type helicopter, have severe flaws. He did at least understand that "An object offers as much resistance to

7844-570: The long lack of a pope, because on their previous trip to China they had received a letter from Kublai Khan to the Pope, and had thus had to leave for China disappointed. During the trip, however, they received news that after 33 months of vacation, finally, the Conclave had elected the new Pope and that he was exactly the archdeacon of Acre. The three of them hurried to return to the Holy Land, where

7950-475: The man-powered propulsive devices proving useless. In an attempt the next year to provide both endurance and controllability, de Rozier developed a balloon having both hot air and hydrogen gas bags, a design which was soon named after him as the Rozière. The principle was to use the hydrogen section for constant lift and to navigate vertically by heating and allowing to cool the hot air section, in order to catch

8056-519: The mid-18th century the Montgolfier brothers in France began experimenting with balloons. Their balloons were made of paper, and early experiments using steam as the lifting gas were short-lived due to its effect on the paper as it condensed. Mistaking smoke for a kind of steam, they began filling their balloons with hot smoky air which they called "electric smoke" and, despite not fully understanding

8162-531: The most common type of rocket and they typically create their exhaust by the combustion of rocket propellant . Chemical rockets store a large amount of energy in an easily released form, and can be very dangerous. However, careful design, testing, construction and use minimizes risks. Marco Polo Marco Polo ( / ˈ m ɑːr k oʊ ˈ p oʊ l oʊ / ; Venetian: [ˈmaɾko ˈpolo] ; Italian: [ˈmarko ˈpɔːlo] ; c.  1254  – 8 January 1324)

8268-411: The most favourable wind at whatever altitude it was blowing. The balloon envelope was made of goldbeater's skin . The first flight ended in disaster and the approach has seldom been used since. Sir George Cayley (1773–1857) is widely acknowledged as the founder of modern aeronautics. He was first called the "father of the aeroplane" in 1846 and Henson called him the "father of aerial navigation." He

8374-539: The new Pope entrusted them with letters for the "Great Khan", inviting him to send his emissaries to Rome. To give more weight to this mission he sent with the Polos, as his legates, two Dominican fathers, Guglielmo of Tripoli and Nicola of Piacenza. They continued overland until they arrived at Kublai Khan 's palace in Shangdu , China (then known as Cathay ). By this time, Marco was 21 years old. Impressed by Marco's intelligence and humility, Kublai appointed him to serve as his foreign emissary to India and Burma . He

8480-405: The places he mentioned in his itinerary, whether he had appropriated the accounts of his father and uncle or other travellers, and some doubted whether he even reached China, or that if he did, perhaps never went beyond Khanbaliq (Beijing). It has been pointed out that Polo's accounts of China are more accurate and detailed than other travellers' accounts of the period. Polo had at times refuted

8586-635: The principles at work, made some successful launches and in 1783 were invited to give a demonstration to the French Académie des Sciences . Meanwhile, the discovery of hydrogen led Joseph Black in c.  1780 to propose its use as a lifting gas, though practical demonstration awaited a gas-tight balloon material. On hearing of the Montgolfier Brothers' invitation, the French Academy member Jacques Charles offered

8692-490: The product of a larger European (and Eurasian) literary and commercial culture", rather than questions of veracity of the account. The book opens with a preface describing his father and uncle travelling to Bolghar where Prince Berke Khan lived. A year later, they went to Ukek and continued to Bukhara . There, an envoy from the Levant invited them to meet Kublai Khan , who had never met Europeans. In 1266, they reached

8798-528: The same Marco Polo, of whom this book relates, ruled this city for three years. This sentence in The Book of Marvels was interpreted as Marco Polo was "the governor" of the city of "Yangiu" Yangzhou for three years, and later of Hangzhou . This claim has raised some controversy. According to David Morgan no Chinese source mentions him as either a friend of the Emperor or as the governor of Yangzhou – indeed no Chinese source mentions Marco Polo at all. In

8904-523: The scene and was survived by his wife and three children. Raspet's most extensive work in aeronautics was in boundary layer control. Through several experiments involving laminar friction curve and high-lift boundaries, he made several breakthroughs regarding sailplanes that would later be incorporated in light aircraft. Because of Raspet's contribution to aeronautical science, a prestigious award has been named in his memory. The Experimental Aircraft Association (EAA), beginning in 1960, has awarded yearly

9010-699: The seat of Kublai Khan at Dadu , present-day Beijing , China. Kublai received the brothers with hospitality and asked them many questions regarding the European legal and political system. He also inquired about the Pope and Church in Rome. After the brothers answered the questions he tasked them with delivering a letter to the Pope, requesting 100 Christians acquainted with the Seven Arts (grammar, rhetoric, logic, geometry, arithmetic, music and astronomy). Kublai Khan requested also that an envoy bring him back oil of

9116-582: The somewhat more detailed Italian of Giovanni Battista Ramusio, together with a Latin manuscript in the Biblioteca Ambrosiana . Other early important sources are R (Ramusio's Italian translation first printed in 1559), and Z (a 15th-century Latin manuscript kept at Toledo, Spain). Another Old French Polo manuscript, dating to around 1350, is held by the National Library of Sweden. One of the early manuscripts Iter Marci Pauli Veneti

9222-522: The standard of scholarship that one would expect in a work of this kind. Her book can only be described as deceptive, both in relation to the author and to the public at large. Questions are posed that, in the majority of cases, have already been answered satisfactorily ... her attempt is unprofessional; she is poorly equipped in the basic tools of the trade, i.e., adequate linguistic competence and research methodology ... and her major arguments cannot withstand close scrutiny. Her conclusion fails to consider all

9328-471: The study of bird flight. Medieval Islamic Golden Age scientists such as Abbas ibn Firnas also made such studies. The founders of modern aeronautics, Leonardo da Vinci in the Renaissance and Cayley in 1799, both began their investigations with studies of bird flight. Man-carrying kites are believed to have been used extensively in ancient China. In 1282 the Italian explorer Marco Polo described

9434-474: The truthfulness of the book and defined Marco as a "prudent, honoured and faithful man". In his writings, the Dominican brother Jacopo d'Acqui explains why his contemporaries were sceptical about the content of the book. He also relates that before dying, Marco Polo insisted that "he had told only a half of the things he had seen". According to some recent research of the Italian scholar Antonio Montefusco,

9540-422: The use of the whirling arm test rig to investigate the aerodynamics of flight, using it to discover the benefits of the curved or cambered aerofoil over the flat wing he had used for his first glider. He also identified and described the importance of dihedral , diagonal bracing and drag reduction, and contributed to the understanding and design of ornithopters and parachutes . Another significant invention

9646-682: The vault of the sky during his travels. Marco told him that during his return trip to the South China Sea , he had spotted what he describes in a drawing as a star "shaped like a sack" (in Latin : ut sacco ) with a big tail ( magna habens caudam ); most likely a comet . Astronomers agree that there were no comets sighted in Europe at the end of the 13th century, but there are records about a comet sighted in China and Indonesia in 1293. This circumstance does not appear in Polo's book of travels . Peter D'Abano kept

9752-492: The very close relationship that Marco Polo cultivated with members of the Dominican Order in Venice suggests that local fathers collaborated with him for a Latin version of the book, which means that Rustichello's text was translated into Latin for a precise will of the Order. Since Dominican fathers had among their missions that of evangelizing foreign peoples (cf. the role of Dominican missionaries in China and in

9858-438: The wall constructed in the earlier periods might have existed, they were not significant or noteworthy at that time. Haw also argued that footbinding was not common even among Chinese during Polo's time and almost unknown among the Mongols. While the Italian missionary Odoric of Pordenone who visited Yuan China mentioned footbinding (it is however unclear whether he was merely relaying something he had heard as his description

9964-447: The work of Rustichello, who was giving what medieval European readers expected to find in a travel book. Apparently, from the very beginning, Marco's story aroused contrasting reactions, as it was received by some with a certain disbelief. The Dominican father Francesco Pipino was the author of a translation into Latin, Iter Marci Pauli Veneti in 1302, just a few years after Marco's return to Venice. Francesco Pipino solemnly affirmed

10070-456: Was Il libro di Marco Polo detto il Milione , which means "The Book of Marco Polo, nicknamed ' Milione ' ". According to the 15th-century humanist Giovanni Battista Ramusio , his fellow citizens awarded him this nickname when he came back to Venice because he kept on saying that Kublai Khan's wealth was counted in millions. More precisely, he was nicknamed Messer Marco Milioni (Mr Marco Millions). However, since also his father Niccolò

10176-619: Was a Venetian merchant, explorer and writer who travelled through Asia along the Silk Road between 1271 and 1295. His travels are recorded in The Travels of Marco Polo (also known as Book of the Marvels of the World and Il Milione , c.  1300 ), a book that described the then-mysterious culture and inner workings of the Eastern world, including the wealth and great size of

10282-440: Was a translation into Latin made by the Dominican brother Francesco Pipino  [ it ] in 1302, just a few years after Marco's return to Venice. Since Latin was then the most widespread and authoritative language of culture, it is suggested that Rustichello's text was translated into Latin for a precise will of the Dominican Order , and this helped to promote the book on a European scale. The first English translation

10388-697: Was at war with the Republic of Genoa . Polo armed a galley equipped with a trebuchet to join the war. He was probably caught by Genoans in a skirmish in 1296, off the Anatolian coast between Adana and the Gulf of Alexandretta (and not during the battle of Curzola (September 1298), off the Dalmatian coast, a claim which is due to a later tradition (16th century) recorded by Giovanni Battista Ramusio ). He spent several months of his imprisonment dictating

10494-484: Was captured by the Genoans. While imprisoned, he dictated stories of his travels to Rustichello da Pisa , a cellmate. He was released in 1299, became a wealthy merchant, married, and had three children. He died in 1324 and was buried in the church of San Lorenzo in Venice . Though he was not the first European to reach China , Marco Polo was the first to leave a detailed chronicle of his experience. His account provided

10600-494: Was lifted straight out of an Arthurian romance Rustichello had written several years earlier, and the account of the second meeting between Polo and Kublai Khan at the latter's court is almost the same as that of the arrival of Tristan at the court of King Arthur at Camelot in that same book. Latham believed that many elements of the book, such as legends of the Middle East and mentions of exotic marvels, might have been

10706-473: Was nicknamed Milione , 19th-century philologist Luigi Foscolo Benedetto was persuaded that Milione was a shortened version of Emilione , and that this nickname was used to distinguish Niccolò's and Marco's branch from other Polo families. His father, Niccolò Polo , a merchant, traded with the Near East , becoming wealthy and achieving great prestige. Niccolò and his brother Maffeo set off on

10812-667: Was sent on many diplomatic missions throughout his empire and in Southeast Asia, (such as in present-day Indonesia , Sri Lanka and Vietnam ), but also entertained the Khan with stories and observations about the lands he saw. As part of this appointment, Marco travelled extensively inside China, living in the emperor's lands for 17 years. Kublai initially refused several times to let the Polos return to Europe, as he appreciated their company and they became useful to him. However, around 1291, he finally granted permission, entrusting

10918-619: Was solemnly baptised at the Second Council of Lyon . At the council, Pope Gregory X promulgated a new Crusade to start in 1278 in liaison with the Mongols. Since its publication, some have viewed the book with skepticism. Some in the Middle Ages regarded the book simply as a romance or fable, due largely to the sharp difference of its descriptions of a sophisticated civilisation in China to other early accounts by Giovanni da Pian del Carpine and William of Rubruck , who portrayed

11024-586: Was the enabling technology of the Space Age , including setting foot on the Moon . Rockets are used for fireworks , weaponry, ejection seats , launch vehicles for artificial satellites , human spaceflight and exploration of other planets. While comparatively inefficient for low speed use, they are very lightweight and powerful, capable of generating large accelerations and of attaining extremely high speeds with reasonable efficiency. Chemical rockets are

11130-411: Was the first true scientific aerial investigator to publish his work, which included for the first time the underlying principles and forces of flight. In 1809 he began the publication of a landmark three-part treatise titled "On Aerial Navigation" (1809–1810). In it he wrote the first scientific statement of the problem, "The whole problem is confined within these limits, viz. to make a surface support

11236-443: Was the tension-spoked wheel, which he devised in order to create a light, strong wheel for aircraft undercarriage. During the 19th century Cayley's ideas were refined, proved and expanded on, culminating in the works of Otto Lilienthal . Lilienthal was a German engineer and businessman who became known as the "flying man". He was the first person to make well-documented, repeated, successful flights with gliders , therefore making

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