A bascule bridge (also referred to as a drawbridge or a lifting bridge ) is a moveable bridge with a counterweight that continuously balances a span , or leaf, throughout its upward swing to provide clearance for boat traffic. It may be single- or double-leafed.
106-461: The name comes from the French term for balance scale , which employs the same principle. Bascule bridges are the most common type of movable span because they open quickly and require relatively little energy to operate, while providing the possibility for unlimited vertical clearance for marine traffic. Bascule bridges have been in use since ancient times, but until the adoption of steam power in
212-440: A balance , which compares the torque on the arm due to a sample weight to the torque on the arm due to a standard reference mass using a horizontal lever . Spring scales measure force , which is the tension force of constraint acting on an object, opposing the local force of gravity. They are usually calibrated so that measured force translates to mass at earth's gravity. The object to be weighed can be simply hung from
318-431: A fulcrum . One plate holds an object of unknown mass (or weight ), while objects of known mass or weight, called weights , are added to the other plate until mechanical equilibrium is achieved and the plates level off, which happens when the masses on the two plates are equal. The perfect scale rests at neutral. A spring scale will make use of a spring of known stiffness to determine mass (or weight). Suspending
424-421: A load cell instead. A voltage is applied to the device, and the weight causes the current through it to change. The current is converted to a digital number by an analog-to-digital converter , translated by digital logic to the correct units, and displayed on the display. Usually, the device is run by a microprocessor chip. A digital bathroom scale is a scale on the floor which a person stands on. The weight
530-617: A cadet branch of Chu's royal house of Mi . Mo'ao, one of the three chancellors of Chu, was exclusively chosen from Qu ( 屈 ) clan. During the early spring and autumn period and before the Ruo'ao rebellion , Lingyin was a position held by Ruo'aos, namely Dou ( 鬭 ) and Cheng ( 成 ). Progenitors of Chu such as viscount Xiong Yi were said to originate from the Jing Mountains ; a chain of mountains located in today's Hubei province . Rulers of Chu systematically migrated states annexed by Chu to
636-582: A certain mass will extend the spring by a certain amount depending on the spring's stiffness (or spring constant ). The heavier the object, the more the spring stretches, as described in Hooke's law . Other types of scales making use of different physical principles also exist. Some scales can be calibrated to read in units of force (weight) such as newtons instead of units of mass such as kilograms . Scales and balances are widely used in commerce, as many products are sold and packaged by mass. The balance scale
742-488: A cloud service or an ERP system for real-time monitoring and management of material flow. A pallet jack scale is a device that combines a pallet jack and a weighing scale. It allows you to weigh and move pallets at the same time, saving time and labor. Pallet jack scales are used in various industries, such as manufacturing, logistics, and shipping. State of Chu Chu ( Chinese : 楚 ; pinyin : Chǔ ; Wade–Giles : Ch'u , Old Chinese : *s-r̥aʔ )
848-400: A constant gravity or acceleration. Very precise measurements are achieved by ensuring that the balance's fulcrum is essentially friction -free (a knife edge is the traditional solution), by attaching a pointer to the beam which amplifies any deviation from a balance position; and finally by using the lever principle, which allows fractional masses to be applied by movement of
954-569: A counterweight against Chu. Wu defeated Qi and then invaded Chu in 506 BC. Following the Battle of Boju , it occupied Chu's capital at Ying, forcing King Zhao to flee to his allies in Yun and " Sui ". King Zhao eventually returned to Ying but, after another attack from Wu in 504 BC, he temporarily moved the capital into the territory of the former state of Ruo . Chu began to strengthen Yue in modern Zhejiang to serve as allies against Wu. Yue
1060-586: A distinct " Chinese " culture. Based on the archaeological finds, Chu's culture was initially quite similar to that of the other Zhou states of the Yellow River basin. However, subsequently, Chu absorbed indigenous elements from the Baiyue lands that it conquered to the south and east, developing a blended culture compared to the northern plains. During the Western Zhou period, the difference between
1166-400: A force to counter the sample being measured and output the result by measuring the force needed to achieve balance. Such a measurement device is called an electromagnetic force restoration sensor. Pendulum type scales do not use springs. These designs use pendulums and operate as a balance that is unaffected by differences in gravity. An example of application of this design are scales made by
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#17327830548521272-419: A fulcrum at its center. For highest accuracy, the fulcrum would consist of a sharp V-shaped pivot seated in a shallower V-shaped bearing. To determine the mass of the object, a combination of reference masses was hung on one end of the beam while the object of unknown mass was hung on the other end (see balance and steelyard balance ). For high precision work, such as empirical chemistry, the center beam balance
1378-436: A kitchen during cooking. These are usually lightweight and compact. In electronic versions of spring scales, the deflection of a beam supporting the unknown mass is measured using a strain gauge , which is a length-sensitive electrical resistance . The capacity of such devices is only limited by the resistance of the beam to deflection. The results from several supporting locations may be added electronically, so this technique
1484-625: A long struggle for supremacy over the lands of the former Qin Empire, which became known as the Chu–Han Contention . The conflict ended in victory for Liu Bang: he proclaimed the Han dynasty and was later honored with the temple name Gaozu, while Xiang Yu committed suicide in defeat. Liu Bang immediately enacted a more traditional and less intrusive administration than the Qin before him, made peace with
1590-424: A margin of error +/- 7 mg. Many microbalances and ultra-microbalances that weigh fractional gram values are torsion balances. A common fiber type is quartz crystal. A microbalance (also called an ultramicrobalance, or nanobalance) is an instrument capable of making precise measurements of the mass of objects of relatively small mass: on the order of a million parts of a gram and below. An analytical balance
1696-412: A meeting with his subjects to discuss his plans for the invasion of Chu. Wang Jian said that the invasion force needed to be at least 600,000 strong, while Li Xin thought that less than 200,000 men would be sufficient. Ying Zheng ordered Li Xin and Meng Wu to lead the army against Chu. The Chu army, led by Xiang Yan , secretly followed Li Xin's army for three days and three nights, before launching
1802-456: A pair of equal-length arms and pivoting in the center of each arm from a central vertical column, creating a parallelogram. From the side of each vertical column a peg extended. To the amazement of observers, no matter where Roberval hung two equal weight along the peg, the scale still balanced. In this sense, the scale was revolutionary: it evolved into the more-commonly encountered form consisting of two pans placed on vertical column located above
1908-410: A personal hand in their development. Even with all the advances in weighing scale design and development, all scales until the seventeenth century AD were variations on the balance scale. The standardization of the weights used – and ensuring traders used the correct weights – was a considerable preoccupation of governments throughout this time. The original form of a balance consisted of a beam with
2014-431: A platform can be floated on a cantilever beam system which brings the proportional force to a noseiron bearing; this pulls on a stilyard rod to transmit the reduced force to a conveniently sized beam. One still sees this design in portable beam balances of 500 kg capacity which are commonly used in harsh environments without electricity, as well as in the lighter duty mechanical bathroom scale (which actually uses
2120-527: A protracted campaign in Huaiyang under Wang Jian. Both soldiers wrote letters requesting supplies of clothing and money from home to sustain the long waiting campaign. The Chu populace in areas conquered by Qin openly ignored the stringent Qin laws and governance, as recorded in the excavated bamboo slips of a Qin administrator in Hubei. Chu aspired to overthrow the painful yoke of Qin rule and re-establishing
2226-641: A riverine transport system of boats augmented by wagons. These are detailed in bronze tallies with gold inlay regarding trade along the river systems connecting with those of the Chu capital at Ying. Although bronze inscriptions from the ancient state of Chu show little linguistic differences from the "Elegant Speech" (yǎyán 雅言) during the Eastern Zhou period , the variety of Old Chinese spoken in Chu has long been assumed to reflect lexical borrowings and syntactical interferences from non-Sinitic substrates , which
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#17327830548522332-491: A separate state. The attitude was captured in a Chinese expression about implacable hostility: "Though Chu has but three clans , Qin shall fall by Chu's hand" ( 楚雖三戶, 亡秦必楚 ). After Ying Zheng declared himself the First Emperor ( Shi Huangdi ) and reigned briefly, the people of Chu and its former ruling house organized the first violent insurrections against the new Qin administration. They were especially resentful of
2438-510: A small mass along the measuring arm of the beam, as described above. For greatest accuracy, there needs to be an allowance for the buoyancy in air, whose effect depends on the densities of the masses involved. To reduce the need for large reference masses, an off-center beam can be used. A balance with an off-center beam can be almost as accurate as a scale with a center beam, but the off-center beam requires special reference masses and cannot be intrinsically checked for accuracy by simply swapping
2544-421: A smooth turbulence-free airflow that prevents balance fluctuation and the measure of mass down to 1 μg without fluctuations or loss of product. Also, the sample must be at room temperature to prevent natural convection from forming air currents inside the enclosure from causing an error in reading. Single-pan mechanical substitution balances maintain consistent response throughout the useful capacity, which
2650-573: A spring scale, internally). The additional pivots and bearings all reduce the accuracy and complicate calibration; the float system must be corrected for corner errors before the span is corrected by adjusting the balance beam and poise. In 1669 the Frenchman Gilles Personne de Roberval presented a new kind of balance scale to the French Academy of Sciences. This scale consisted of a pair of vertical columns separated by
2756-472: A stand and the outside gears fixed to pans, as well as the "sprocket gear balance" consisting of a bicycle-type chain looped around an odd number of sprockets with the central one fixed and the outermost two free to pivot and attached to a pan. Because it has more moving joints which add friction, the Roberval balance is consistently less accurate than the traditional beam balance, but for many purposes this
2862-442: A surprise offensive and destroying Li Xin army. Upon learning of Li's defeat, Ying Zheng replaced Li with Wang Jian, putting Wang in command of the 600,000-strong army he had requested earlier and placing Meng Wu beneath him as a deputy. Worried that the Qin tyrant might fear the power he now possessed and order him executed upon some pretense, Wang Jian constantly sent messengers back to the king in order to remain in contact and reduce
2968-467: A swift assault. The Qin forces pursued the retreating Chu forces to Qinan ( 蕲南 ; northwest of present-day Qichun in Hubei ) and Xiang Yan was either killed in the action or committed suicide following his defeat. The next year, in 223 BC, Qin launched another campaign and captured the Chu capital Shouchun. King Fuchu was captured and his state annexed. The following year, Wang Jian and Meng Wu led
3074-426: A two-pan, beam balance) are one of the traditional symbols of justice , as wielded by statues of Lady Justice . This corresponds to the use in a metaphor of matters being "held in the balance". It has its origins in ancient Egypt. Scales also are widely used as a symbol of finance, commerce, or trade, in which they have played a traditional, vital role since ancient times. For instance, balance scales are depicted in
3180-460: Is a class of balance designed to measure small mass in the sub-milligram range. The measuring pan of an analytical balance (0.1 mg or better) is inside a transparent enclosure with doors so that dust does not collect and so any air currents in the room do not affect the balance's operation. This enclosure is often called a draft shield. The use of a mechanically vented balance safety enclosure , which has uniquely designed acrylic airfoils, allows
3286-412: Is a refinement by Joseph Strauss of the fixed-trunnion. The rolling lift trunnion (sometimes a "Scherzer" rolling lift), raises the span by rolling on a track resembling a rocking-chair base. The "Scherzer" rolling lift is a refinement patented in 1893 by American engineer William Donald Scherzer . The rarer Rall type combines rolling lift with longitudinal motion on trunnions when opening. It
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3392-439: Is a weighing system that is built into a forklift truck. It allows for the weighing of loads while they are being lifted and transported by the forklift. This eliminates the need for separate weighing operations and reduces the time and labor required for material handling operations. Forklift scales are used in various industries, such as manufacturing, logistics, and shipping. Material Handler Scale : A Material Handler Scale
3498-400: Is a weighing system that is integrated into a material handler machine, such as a grapple or a magnet. It allows for the accurate and efficient weighing of materials while they are being moved, unloaded, or loaded. A Material Handler Scale can be used in various industries, such as scrap, recycling, waste, and port and harbor. A Material Handler Scale can also transfer the weighing information to
3604-423: Is achieved by maintaining a constant load on the balance beam and thus the fulcrum by subtracting mass on the same side of the beam to which the sample is added. Electronic analytical scales measure the force needed to counter the mass being measured rather than using actual masses. As such they must have calibration adjustments made to compensate for gravitational differences. They use an electromagnet to generate
3710-491: Is compensated for by its usability. The torsion balance is one of the most mechanically accurate of analog balances. Pharmacy schools still teach how to use torsion balances in the U.S. It utilizes pans like a traditional balance that lie on top of a mechanical chamber which bases measurements on the amount of twisting of a wire or fiber inside the chamber. The scale must still use a calibration weight to compare against, and can weigh objects greater than 120 mg and come within
3816-451: Is shown on an LED or LCD display. The digital electronics may do more than just display weight, it may calculate body fat, BMI , lean mass, muscle mass, and water ratio. Some modern bathroom scales are wirelessly or cellularly connected and have features like smartphone integration, cloud storage, and fitness tracking. They are usually powered by a button cell, or battery of AA or AAA size. Digital kitchen scales are used for weighing food in
3922-524: Is still one of the most accurate technologies available, and is commonly used for calibrating test masses. However, bronze fragments discovered in central Germany and Italy had been used during the Bronze Age as an early form of currency. In the same time period, merchants had used standard weights of equivalent value between 8 and 10.5 grams from Great Britain to Mesopotamia. The balance (also balance scale , beam balance and laboratory balance )
4028-498: Is such a simple device that its usage likely far predates the evidence. What has allowed archaeologists to link artifacts to weighing scales are the stones for determining absolute mass. The balance scale itself was probably used to determine relative mass long before absolute mass. The oldest attested evidence for the existence of weighing scales dates to the Fourth Dynasty of Egypt , with Deben (unit) balance weights, from
4134-470: Is suitable for determining the mass of very heavy objects, such as trucks and rail cars, and is used in a modern weighbridge . These scales are used in the modern bakery , grocery , delicatessen , seafood , meat , produce and other perishable goods departments. Supermarket scales can print labels and receipts, mark mass and count, unit price, total price and in some cases tare . Some modern supermarket scales print an RFID tag that can be used to track
4240-410: Is used to describe a weighing device that is used to measure the mass, force exertion , tension, and resistance of an object without the need of a power supply. Types of mechanical scales include decimal balances , spring scales , hanging scales, triple beam balances , and force gauges . A spring scale measures mass by reporting the distance that a spring deflects under a load. This contrasts to
4346-439: Is used. It is also common in high-capacity applications such as crane scales to use hydraulic force to sense mass. The test force is applied to a piston or diaphragm and transmitted through hydraulic lines to a dial indicator based on a Bourdon tube or electronic sensor. Electronic digital scales display weight as a number, usually on a liquid crystal display (LCD). They are versatile because they may perform calculations on
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4452-524: The Songs of Chu , historical records, excavated bamboo documents such as the Guodian slips , and other artifacts reveal heavy Taoist and native folk influence in Chu culture. The disposition to a spiritual, often pleasurable and decadent lifestyle, and the confidence in the size of the Chu realm led to the inefficiency and eventual destruction of the Chu state by the ruthless Legalist state of Qin. Even though
4558-530: The se was preferred over the zither , while both instruments were equally preferred in the northern Zhou states. Chu came into frequent contact with other peoples in the south, most notably the Ba , Yue , and the Baiyue . Numerous burials and burial objects in the Ba and Yue styles have been discovered throughout the territory of Chu, co-existing with Chu-style burials and burial objects. Some archaeological records of
4664-524: The Legalistic reforms of Shang Yang . In 241 BC, five of the seven major warring states–Chu, Zhao, Wei, Yan and Han–formed an alliance to fight the rising power of Qin. King Kaolie of Chu was named the leader of the alliance and Lord Chunshen the military commander. According to historian Yang Kuan , the Zhao general Pang Nuan ( 庞煖 ) was the actual commander in the battle. The allies attacked Qin at
4770-532: The Sichuan Basin was its great agricultural output and its control over the upper reaches of the Yangtze River , leading directly into the Chu heartland. King Huiwen of Qin opted to support Sima Cuo. In 316 BC, Qin invaded and conquered Shu and nearby Ba , expanding downriver in the following decades. In 278 BC, the Qin general Bai Qi finally conquered Chu's capital at Ying. Following
4876-722: The Xiongnu through heqin intermarriages, rewarded his allies with large fiefdoms, and allowed the population to rest from centuries of warfare. The core Chu territories centered in Pengcheng was granted first to general Han Xin and then to Liu Bang's brother Liu Jiao as the Kingdom of Chu . By the time of Emperor Wu of Han , the southern folk culture and aesthetics were mixed with the Han-sponsored Confucian tradition and Qin-influenced central governance to create
4982-622: The fiefdom of Chu in the Nanyang Basin and the hereditary title of 子 ( zǐ , " viscount "). Then the first capital of Chu was established at Danyang (present-day Xichuan in Henan). In 977 BC, during his campaign against Chu , King Zhao of Zhou 's boat sank and he drowned in the Han River . After this death, Zhou ceased to expand to the south, allowing the southern tribes and Chu to cement their own autonomy much earlier than
5088-412: The 1850s, very long, heavy spans could not be moved quickly enough for practical application. There are three types of bascule bridge and the counterweights to the span may be located above or below the bridge deck. The fixed- trunnion (sometimes a "Chicago" bascule) rotates around a large axle that raises the span(s). The Chicago bascule name derives from the location where it is widely used, and
5194-400: The 1940s, various electronic devices were being attached to these designs to make readings more accurate. Load cells – transducers that convert force to an electrical signal – have their beginnings as early as the late nineteenth century, but it was not until the late twentieth century that their widespread usage became economically and technologically viable. A mechanical scale or balance
5300-510: The Central plains. However, this image originated with the later development of Chu relative to the Central plains, and the stereotype was retrospectively cultivated by Confucian scholars in the Qin dynasty, to indirectly criticise the ruling regime, and the Han dynasty as a means of curbing their ideological opponents who were associated with such cultural practices. As the founder of the Han dynasty
5406-499: The Chu appear at Mawangdui . After the Han dynasty , some Confucian scholars considered Chu culture with distaste, criticizing the "lewd" music and shamanistic rituals associated with Chu culture. Chu artisanship includes color, especially the lacquer woodworks. Red and black pigmented lacquer were most used. Silk-weaving also attained a high level of craftsmanship, creating lightweight robes with flowing designs. These examples (as at Mawangdui) were preserved in waterlogged tombs where
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#17327830548525512-547: The Chu capital moved south-east from Danyang to Ying. Chu first consolidated its power by absorbing other states in its original area (modern Hubei ), then it expanded into the north towards the North China Plain . In the summer of 648 BC, the State of Huang was annexed by the state of Chu. The threat from Chu resulted in multiple northern alliances under the leadership of Jin . These alliances kept Chu in check, and
5618-456: The Chu kingdom lost their first major battle at the Chengpu in 632 BC. During the 6th century BC, Jin and Chu fought numerous battles over the hegemony of central plain . In 597 BC , Jin was defeated by Chu in the battle of Bi , causing Jin's temporary inability to counter Chu's expansion. Chu strategically used the state of Zheng as its representative in the central plain area, through
5724-464: The Chu may have acquired as a result of its southern migration into what Tian Jizhou believed to be a Kra–Dai or (para-) Hmong–Mien area in southern China. Recent excavated texts, corroborated by dialect words recorded in the Fangyan , further demonstrated substrate influences, but there are competing hypotheses on their genealogical affiliation. Noticing that both 荆 Jīng and 楚 Chǔ refer to
5830-571: The Chu tomb in Xichuan, Henan Province are complex in shape. Dated to the mid sixth century BC, it was one of the early confirmed lost-wax cast artifacts discovered in China proper. Later Chu burials, especially during the Warring States, featured distinct burial objects , such as colorful lacquerware , iron, and silk, accompanied by a reduction in bronze vessel offerings . A common Chu motif
5936-661: The Fangcheng mountain. Strategically, Fangcheng is an ideal defense against states of central plain . Due to its strategic value, numerous castles were built on the Fangcheng mountain. Yunmeng Ze in Jianghan Plain was an immense freshwater lake that historically existed in Chu's realm, It was crossed by Yanzi river, the northern Yunmeng was named Meng ( 夢 ), the southern Yunmeng was known as Yun ( 雲 ). The lake's body covers parts of today's Zhijiang, Jianli , Shishou , Macheng , Huanggang , and Anlu . Shaoxi Pass
6042-593: The Jing mountains in order to control them more efficiently. East of Jing mountains are the Tu ( 塗 ) mountains. In the north-east part of Chu are the Dabie mountains ; the drainage divide of Huai river and Yangtse river . The first capital of Chu, Danyang ( 丹陽 ) was located in today's Zhijiang , Hubei province. Ying ( 郢 ), one of the later capitals of Chu, is known by its contemporary name Jingzhou . In Chu's northern border lies
6148-466: The Qin corvée ; folk poems record the mournful sadness of Chu families whose men worked in the frigid north to construct the Great Wall of China . The Dazexiang Uprising occurred in 209 BC under the leadership of a Chu peasant, Chen Sheng , who proclaimed himself "King of Rising Chu" ( Zhangchu ). This uprising was crushed by the Qin army but it inspired a new wave of other rebellions. One of
6254-629: The Qin army against Wuyue around the mouth of the Yangtze , capturing the descendants of the royal family of Yue . These conquered territories became the Kuaiji Prefecture of the Qin Empire. At their peak, Chu and Qin together fielded over 1,000,000 troops, more than the massive Battle of Changping between Qin and Zhao 35 years before. The excavated personal letters of two regular Qin soldiers, Hei Fu ( 黑夫 ) and Jing ( 惊 ), tell of
6360-431: The Qin realm lacked the vast natural resources and waterways of Chu, the Qin government maximized its output under the efficient minister Shang Yang , installing a meritocracy focused solely on agricultural and military might. Archaeological evidence shows that Chu music was annotated differently from Zhou. Chu music also showed an inclination for using different performance ensembles, as well as unique instruments. In Chu,
6466-549: The Toledo Scale Company. A programmable scale has a programmable logic controller in it, allowing it to be programmed for various applications such as batching, labeling, filling (with check weight function), truck scales , and more. Another important function is counting, e. g. used to count small parts in larger quantities during the annual stock taking. Counting scales (which can also do just weighing) can range from mg to tonnes. The scales (specifically,
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#17327830548526572-625: The UK by the International Organization of Legal Metrology . An industrial weighing scale is a device that measures the weight or mass of objects in various industries. It can range from small bench scales to large weighbridges, and it can have different features and capacities. Industrial weighing scales are used for quality control, inventory management, and trade purposes. There are many kinds of industrial weighing scales that are used for different purposes and applications. Some of
6678-483: The beam is as close to equilibrium as possible. In precision balances, a more accurate determination of the mass is given by the position of a sliding mass moved along a graduated scale. A decimal balance uses the lever in which the arm for weights is 10 times longer than the arm for weighted objects, so that much lighter weights may be used to weigh heavy object. Similarly a centesimal balance uses arms in ratio 1:100. Unlike spring-based scales, balances are used for
6784-412: The common types are: Weighbridges : A large scale that can weigh trucks, lorries, containers, and other heavy-duty vehicles. They are used in industries like manufacturing, shipping, mining, agriculture, etc Container Stacker Scale : A container stacker scale is a specialized weighing system designed for accurately measuring the weight of shipping containers. It is typically integrated into
6890-429: The contents of the pans as a center-beam balance can. To reduce the need for small graduated reference masses, a sliding weight called a poise can be installed so that it can be positioned along a calibrated scale. A poise adds further intricacies to the calibration procedure, since the exact mass of the poise must be adjusted to the exact lever ratio of the beam. For greater convenience in placing large and awkward loads,
6996-511: The culture of Chu and the Central Plains states to the north was negligible. Only in the late Spring and Autumn period does Chu culture begin to diverge, preserving some older aspects of the culture and developing new phenomena. It also absorbed some elements from annexed areas. The culture of Chu had significant internal diversity from locality to locality. Chu, like Qin and Yan , was often described as being not as cultured by people in
7102-432: The displacement of the spring by any variety of mechanisms to produce an estimate of the gravitational force applied by the object. Rack and pinion mechanisms are often used to convert the linear spring motion to a dial reading. Spring scales have two sources of error that balances do not: the measured mass varies with the strength of the local gravitational force (by as much as 0.5% at different locations on Earth), and
7208-642: The earliest design for such a device dates to 1770 and credits Richard Salter, an early scale-maker. Spring scales came into wide usage in the United Kingdom after 1840 when R. W. Winfield developed the candlestick scale for weighing letters and packages, required after the introduction of the Uniform Penny Post . Postal workers could work more quickly with spring scales than balance scales because they could be read instantaneously and did not have to be carefully balanced with each measurement. By
7314-435: The elasticity of the measurement spring can vary slightly with temperature. With proper manufacturing and setup, however, spring scales can be rated as legal for commerce. To remove the temperature error, a commerce-legal spring scale must either have temperature-compensated springs or be used at a fairly constant temperature. To eliminate the effect of gravity variations, a commerce-legal spring scale must be calibrated where it
7420-400: The equipment used for loading and unloading containers, such as container handlers or stacker cranes. Container stacker scales provide real-time weight measurements, allowing logistics professionals to ensure that each container is loaded within the specified weight limits. Container stacker scales are used in industries like ports, shipping, and logistics Forklift scale : A forklift scale
7526-841: The fall of Ying, the Chu government moved to various locations in the east until settling in Shouchun in 241 BC. After a massive two-year struggle, Bai Qi lured the main Zhao force of 400,000 men onto the field, surrounding them and forcing their surrender at Changping in 260 BC. The Qin army massacred their prisoners, removing the last major obstacle to Qin dominance over the Chinese states. By 225 BC, only four kingdoms remained: Qin, Chu, Yan , and Qi . Chu had recovered sufficiently to mount serious resistance. Despite its size, resources, and manpower, though, Chu's corrupt government worked against it. In 224 BC, Ying Zheng called for
7632-402: The fulcrum and the parallelogram below them. The advantage of the Roberval design is that no matter where equal weights are placed in the pans, the scale will still balance. Further developments have included a "gear balance" in which the parallelogram is replaced by any odd number of interlocking gears greater than one, with alternating gears of the same size and with the central gear fixed to
7738-505: The high priest of Chu, multiple entries in Zuo Zhuan indicated their role as oracles. Other Yins recorded by history were: Yuyin, Lianyin, Jiaoyin, Gongjiyin, Lingyin, Huanlie Zhi Yin (Commander of Palace guards) and Yueyin (Minister of Music). In counties and commanderies, Gong ( 公 ), also known as Xianyin (minister of county) was the chief administrator. In many cases, positions in Chu's bureaucracy were hereditarily held by members of
7844-812: The item for tampering or returns. In most cases, these types of scales have a sealed calibration so that the reading on the display is correct and cannot be tampered with. In the US, the scales are certified by the National Type Evaluation Program (NTEP), in South Africa by the South African Bureau of Standards , in Australia, they are certified by the National Measurement Institute (NMI) and in
7950-426: The king and left the state very powerful until the late 4th century BC, when Zhao and Qin were ascendant. Chu's powerful army once again became successful, defeating the states of Wei and Yue . Yue was partitioned between Chu and Qi in either 334 or 333 BC. However, the officials of Chu wasted no time in their revenge and Wu Qi was assassinated at King Dao's funeral in 381 BC. Prior to Wu's service in
8056-453: The king's suspicion. Wang Jian's army passed through southern Chen ( 陳 ; present-day Huaiyang in Henan) and made camp at Pingyu. The Chu armies under Xiang Yan used their full strength against the camp but failed. Wang Jian ordered his troops to defend their positions firmly but avoid advancing further into Chu territory. After failing to lure the Qin army into an attack, Xiang Yan ordered a retreat; Wang Jian seized this opportunity to launch
8162-520: The lacquer did not peel off over time and in tombs sealed with coal or white clay. Chu used the calligraphic script called "Birds and Worms" style , which was borrowed by the Wu and Yue states. It has a design that embellishes the characters with motifs of animals, snakes, birds, and insects. This is another representation of the natural world and its liveliness. Chu produced broad bronze swords that were similar to Wuyue swords but not as intricate. Chu created
8268-526: The late 4th century BC, however, Chu's prominent status had fallen into decay. As a result of several invasions headed by Zhao and Qin, Chu was eventually completely wiped out by Qin. The Chu state was completely eradicated by the Qin dynasty. According to the Records of the Warring States , a debate between the Diplomat strategist Zhang Yi and the Qin general Sima Cuo led to two conclusions concerning
8374-557: The leaders, Jing Ju of Chu, proclaimed himself the new king of Chu. Jing Ju was defeated by another rebel force under Xiang Liang . Xiang installed Xiong Xin , a scion of Chu's traditional royal family, on the throne of Chu under the regnal name King Huai II. In 206 BC, after the fall of the Qin Empire, Xiang Yu , Xiang Liang's nephew, proclaimed himself the "Hegemon-King of Western Chu" and promoted King Huai II to "Emperor Yi". He subsequently had Yi assassinated. Xiang Yu then engaged with Liu Bang , another prominent anti-Qin rebel, in
8480-421: The means of intimidation and threats, Chu forced Zheng to ally with itself. On the other hand, Jin had to balance out Chu's influence by repeatedly allying with Lu , Wey , and Song . The tension between Chu and Jin did not loosen until the year of 579 BC when a truce was signed between the two states. At the beginning of the sixth century BC, Jin strengthened the state of Wu near the Yangtze delta to act as
8586-423: The measurement and transmit it to other digital devices. On a digital scale, the force of the weight causes a spring to deform, and the amount of deformation is measured by one or more transducers called strain gauges . A strain gauge is a conductor whose electrical resistance changes when its length changes. Strain gauges have limited capacity and larger digital scales may use a hydraulic transducer called
8692-493: The precision measurement of mass as their accuracy is not affected by variations in the local gravitational field. (On Earth, for example, these can amount to ±0.5% between locations. ) A change in the strength of the gravitational field caused by moving the balance does not change the measured mass, because the moments of force on either side of the center balanced beam are affected equally. A center beam balance will render an accurate measurement of mass at any location experiencing
8798-484: The present-day provinces of Hubei and Hunan , along with parts of Chongqing , Guizhou , Henan , Anhui , Jiangxi , Jiangsu , Zhejiang , and Shanghai . For more than 400 years, the Chu capital Danyang was located at the junction of the Dan and Xi Rivers near present-day Xichuan County , Henan, but later moved to Ying . The house of Chu originally bore the ancestral temple surname Nai ( 嬭 OC: /*rneːlʔ/) which
8904-508: The reign of Sneferu (c. 2600 BC) excavated, though earlier usage has been proposed. Carved stones bearing marks denoting mass and the Egyptian hieroglyphic symbol for gold have been discovered, which suggests that Egyptian merchants had been using an established system of mass measurement to catalog gold shipments or gold mine yields. Although no actual scales from this era have survived, many sets of weighing stones as well as murals depicting
9010-424: The resources to maintain their positions for long. To defeat them, we must strike swiftly, unexpectedly and retreat quickly before they can counter-attack. This will create unease in their weary soldiers and reduce their fighting spirit. Thus, with persistence, their army can be defeated. During the late Warring States period, Chu was increasingly pressured by Qin to its west, especially after Qin enacted and preserved
9116-515: The royal entourage. Many officials had no meaningful task except taking money and Chu's army, while large, was of low quality. In the late 390s BC, King Dao of Chu made Wu Qi his chancellor . Wu's reforms began to transform Chu into an efficient and powerful state in 389 BC, as he lowered the salaries of officials and removed useless officials. He also enacted building codes to make the capital Ying seem less barbaric. Despite Wu Qi's unpopularity among Chu's ruling class, his reforms strengthened
9222-553: The seal of the U.S. Department of the Treasury and the Federal Trade Commission . Scales are also the symbol for the astrological sign Libra . Scales (specifically, a two-pan, beam balance in a state of equal balance) are the traditional symbol of Pyrrhonism indicating the equal balance of arguments used in inducing epoche . Although records dating to the 1700s refer to spring scales for measuring mass,
9328-431: The spring or set on a pivot and bearing platform. In a spring scale, the spring either stretches (as in a hanging scale in the produce department of a grocery store ) or compresses (as in a simple bathroom scale). By Hooke's law , every spring has a proportionality constant that relates how hard it is pulled to how far it stretches. Weighing scales use a spring with a known spring constant (see Hooke's law ) and measure
9434-399: The state of Chu, Wu lived in the state of Wei, where his military analysis of the six opposing states was recorded in his magnum opus, The Book of Master Wu . Of Chu, he said: The Chu people are soft and weak. Their lands stretch far and wide, and the government cannot effectively administer the expanse. Their troops are weary and although their formations are well-ordered, they do not have
9540-446: The states to the north. The Chu viscount Xiong Qu overthrew E in 863 BC but subsequently made its capital Ezhou one of his capitals. In either 703 or 706, the ruler Xiong Tong became the ruler of Chu. Under the reign of King Zhuang , Chu reached the height of its power and its ruler was considered one of the five Hegemons of the era. After a number of battles with neighboring states, sometime between 695 and 689 BC,
9646-408: The strategic Hangu Pass but were defeated. King Kaolie blamed Lord Chunshen for the loss and began to mistrust him. Afterwards, Chu moved its capital east to Shouchun , farther away from the threat of Qin. As Qin expanded into Chu's territory, Chu was forced to expand southwards and eastwards, absorbing local cultural influences along the way. Lu was conquered by King Kaolie in 223 BC. By
9752-594: The thorny chaste tree (genus Vitex ), Schuessler (2007) proposes two Austroasiatic comparanda: The Mo'ao ( 莫敖 ) and the Lingyin ( 令尹 ) were the top government officials of Chu. Sima was the military commander of Chu's army. Lingyin, Mo'ao and Sima were the San Gong ( 三公 ) of Chu. In the Spring and Autumn period, Zuoyin ( 左尹 ) and Youyin ( 右尹 ) were added as the undersecretaries of Lingyin. Likewise, Sima ( 司馬 )
9858-456: The unification of China. Zhang Yi argued in favor of conquering Han and seizing the Mandate of Heaven from the powerless Zhou king would be wise. Sima Cuo, however, considered that the primary difficulty was not legitimacy but the strength of Qin's opponents; he argued that "conquering Shu is conquering Chu" and, "once Chu is eliminated, the country will be united". The importance of Shu in
9964-560: The use of balance scales suggest widespread usage. Examples, dating c. 2400–1800 BC , have also been found in the Indus River valley . Uniform, polished stone cubes discovered in early settlements were probably used as mass-setting stones in balance scales. Although the cubes bear no markings, their masses are multiples of a common denominator. The cubes are made of many different kinds of stones with varying densities. Clearly their mass, not their size or other characteristics,
10070-485: The worship of gibbons and other animals perceived to have auspicious amounts of qi . Later Chu culture was known for its affinity for shamans . The Chu culture and government supported Taoism and native shamanism supplemented with some Confucian glosses on Zhou ritual. Chu people affiliated themselves with the god of fire Zhurong in Chinese mythology. For this reason, fire worshiping and red coloring were practiced by Chu people. The naturalistic and flowing art,
10176-840: Was a factor in sculpting these cubes. In China, the earliest weighing balance excavated was from a tomb of the State of Chu of the Chinese Warring States Period dating back to the 3rd to 4th century BC in Mount Zuojiagong near Changsha , Hunan. The balance was made of wood and used bronze masses. Variations on the balance scale, including devices like the cheap and inaccurate bismar (unequal-armed scales), began to see common usage by c. 400 BC by many small merchants and their customers. A plethora of scale varieties each boasting advantages and improvements over one another appear throughout recorded history, with such great inventors as Leonardo da Vinci lending
10282-686: Was an ancient Chinese state during the Zhou dynasty . Their first ruler was King Wu of Chu in the early 8th century BC. Chu was located in the south of the Zhou heartland and lasted during the Spring and Autumn period . At the end of the Warring States period it was destroyed by the Qin in 223 BC during the Qin's wars of unification . Also known as Jing ( 荊 ) and Jingchu ( 荊楚 ), Chu included most of
10388-458: Was an important outpost in the mountainous western border of Chu. It was located in today's Wuguan town of Danfeng County , Shaanxi . Any forces that marched from the west, mainly from Qin, to Chu's realm would have to pass Shaoxi. In traditional Chinese astronomy , Chu is represented by a star in the "Twelve States" asterism , part of the " Girl " lunar mansion in the " Black Turtle " symbol . Opinions differ, however, as to whether that star
10494-430: Was assisted by Zuosima ( 左司馬 ) and Yousima ( 右司馬 ) respectively. Mo'ao's status was gradually lowered while Lingyin and Sima became more powerful posts in the Chu court. Ministers whose functions vary according to their titles were called Yin ( 尹 ). For example: Lingyin (Prime minister), Gongyin (Minister of works), and Zhenyin were all suffixed by the word "Yin". Shenyin ( 沈尹 ) was the minister of religious duties or
10600-416: Was from the state, Chu culture would later become a basis of the culture of the later Han dynasty, along with that of the Qin dynasty's and other preceding states' from the Warring States period. Early Chu burial offerings consisted primarily of bronze vessels in the Zhou style. The bronze wares of the state of Chu also have their own characteristics. For example, the bronze Jin (altar table) unearthed from
10706-443: Was initially subjugated by King Fuchai of Wu until he released their king Goujian , who took revenge for his former captivity by crushing and completely annexing Wu. Freed from its difficulties with Wu, Chu annexed Chen in 479 BC and overran Cai to the north in 447 BC. By the end of the 5th century BC, the Chu government had become very corrupt and inefficient, with much of the state's treasury used primarily to pay for
10812-584: Was later written as Mi ( 芈 OC: /*meʔ/). They also bore the lineage name Yan ( 酓 OC: /*qlamʔ/, /*qʰɯːm/) which would later be written Xiong ( 熊 OC: /*ɢʷlɯm/). According to legends recounted in Sima Qian 's Records of the Grand Historian , the ruling family of Chu descended from the Yellow Emperor and his grandson and successor Zhuanxu . Zhuanxu's great-grandson Wuhui ( 吳回 )
10918-558: Was patented (1901) by Theodor Rall. One of the few surviving examples is the Broadway Bridge (1913), in Portland, Oregon. Weighing scale#Balance scales A scale or balance is a device used to measure weight or mass . These are also known as mass scales , weight scales , mass balances , massometers , and weight balances . The traditional scale consists of two plates or bowls suspended at equal distances from
11024-484: Was put in charge of fire by Emperor Ku and given the title Zhurong . Wuhui's son Luzhong ( 陸終 ) had six sons, all born by Caesarian section . The youngest, Jilian , adopted the ancestral surname Mi . Jilian's descendant Yuxiong was the teacher of King Wen of Zhou (r. 1099–1050 BC). After the Zhou overthrew the Shang dynasty , King Cheng (r. 1042–1021 BC) enfeoffed Yuxiong's great-grandson Xiong Yi with
11130-400: Was the first mass measuring instrument invented. In its traditional form, it consists of a pivoted horizontal lever with arms of equal length – the beam or tron – and a weighing pan suspended from each arm (hence the plural name " scales " for a weighing instrument). The unknown mass is placed in one pan and standard masses are added to the other pan until
11236-401: Was the vivid depiction of wildlife, mystical animals, and natural imagery, such as snakes , dragons , phoenixes , tigers, and free-flowing clouds and serpent-like beings. Some archaeologists speculate that Chu may have had cultural connections to the previous Shang dynasty , since many motifs used by Chu appeared earlier at Shang sites such as serpent-tailed gods. Another common Chu idea was
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