78-424: A mimeograph machine (often abbreviated to mimeo , sometimes called a stencil duplicator or stencil machine ) was a low-cost duplicating machine that worked by forcing ink through a stencil onto paper. The process was called mimeography , and a copy made by the process was a mimeograph . Mimeographs, along with spirit duplicators and hectographs , were common technologies for printing small quantities of
156-406: A photographic film . This was used commercially as "celluloid", a highly flammable plastic that until the mid-20th century formed the basis for lacquers and photographic film. On May 2, 1887, Hannibal Goodwin filed a patent for "a photographic pellicle and process of producing same ... especially in connection with roller cameras", but the patent was not granted until September 13, 1898. In
234-596: A broken heating pipe at the Cleveland Clinic in Ohio . That tragedy claimed 123 lives during the fire and additional fatalities several days later, when hospitalized victims died due to inhaling excessive amounts of smoke from the burning film, which was laced with toxic gases such as sulfur dioxide and hydrogen cyanide . Related fires in other medical facilities prompted the growing disuse of nitrocellulose stock for X-rays by 1933, nearly two decades before its use
312-458: A cotton apron, and wiped it up. He hung the apron on the stove door to dry, and as soon as it was dry, a flash occurred as the apron ignited. His preparation method was the first to be widely used. The method was to immerse one part of fine cotton in 15 parts of an equal blend of sulfuric acid and nitric acid. After two minutes, the cotton was removed and washed in cold water to set the esterification level and to remove all acid residue. The cotton
390-516: A darker, more legible image. Spirit duplicated images were usually tinted a light purple or lavender, which gradually became lighter over the course of some dozens of copies. Mimeography was often considered "the next step up" in quality, capable of producing hundreds of copies. Print runs beyond that level were usually produced by professional printers or, as the technology became available, xerographic copiers . Mimeographed images generally have much better durability than spirit-duplicated images, since
468-437: A dead entry, but shows the A.B. Dick Company of Chicago as the owner of the name. Over time, the term became generic and is now an example of a genericized trademark . ( Roneograph , also Roneo machine , was another trademark used for mimeograph machines, the name being a contraction of Rotary Neostyle .) In 1891, David Gestetner patented his Automatic Cyclostyle. This was one of the first rotary machines that retained
546-405: A distinctive and heavy scent. One uses a regular typewriter, with a stencil setting, to create a stencil. The operator loads a stencil assemblage into the typewriter like paper and uses a switch on the typewriter to put it in stencil mode. In this mode, the part of the mechanism which lifts the ribbon between the type element and the paper is disabled so that the bare, sharp type element strikes
624-437: A document, as in office work, classroom materials, and church bulletins. For even smaller quantities, up to about five, a typist would use carbon paper . Early fanzines were printed by mimeograph because the machines and supplies were widely available and inexpensive. Beginning in the late 1960s and continuing into the 1970s, photocopying gradually displaced mimeographs, spirit duplicators, and hectographs. Use of stencils
702-463: A duplicate on the second sheet. The process was commercialized and Zuccato applied for a patent in 1895 having stencils prepared by typewriting. Thomas Edison received US patent 180,857 for Autographic Printing on August 8, 1876. The patent covered the electric pen, used for making the stencil, and the flatbed duplicating press. In 1880, Edison obtained a further patent, US 224,665: "Method of Preparing Autographic Stencils for Printing," which covered
780-407: A flame. For this reason, immersing burning film in water may not extinguish it, and could actually increase the amount of smoke produced. Owing to public safety precautions, London Underground forbade transport of movies on its system until well past the introduction of safety film. Cinema fires caused by the ignition of nitrocellulose film stock commonly occurred as well. In Ireland in 1926, it
858-422: A hard finish with a deep lustre. It is normally the first coat applied, then it is sanded and followed by other coatings that bond to it. Nail polish contains nitrocellulose, as it is inexpensive, dries quickly to a hard film, and does not damage skin. The explosive applications are diverse and nitrate content is typically higher for propellant applications than for coatings. For space flight, nitrocellulose
SECTION 10
#1732782893042936-410: A mimeograph, called a digital duplicator , or copyprinter , contains a scanner , a thermal head for stencil cutting, and a large roll of stencil material entirely inside the unit. The stencil material consists of a very thin polymer film laminated to a long-fiber non-woven tissue. It makes the stencils and mounts and unmounts them from the print drum automatically, making it almost as easy to operate as
1014-524: A nitrate base in the west, but rumors exist of 16 mm nitrate film having been produced in the former Soviet Union and China. Nitrate dominated the market for professional-use 35 mm motion picture film from the industry's origins to the early 1950s. While cellulose acetate-based safety film, notably cellulose diacetate and cellulose acetate propionate, was produced in the gauge for small-scale use in niche applications (such as printing advertisements and other short films to enable them to be sent through
1092-653: A number of reasons including environmental regulation and the cost of application vs. "poly" finishes. However, Gibson still use nitrocellulose lacquers on all of their guitars, as well as Fender when reproducing historically accurate guitars. The nitrocellulose lacquer yellows and cracks over time, and custom shops will reproduce this aging to make instruments appear vintage. Guitars made by smaller shops (luthiers) also often use "nitro" as it has an almost mythical status among guitarists. Because of its explosive nature, not all applications of nitrocellulose were successful. In 1869, with elephants having been poached to near extinction,
1170-472: A photocopier. The Risograph is the best known of these machines. Although mimeographs remain more economical and energy-efficient in mid-range quantities, easier-to-use photocopying and offset printing have replaced mimeography almost entirely in developed countries . Mimeography continues to be used in some developing countries because it is a simple, cheap, and robust technology. Many mimeographs can be hand-cranked, requiring no electricity. Mimeographs and
1248-439: A precursor to ASCII art . Because changing ink color in a mimeograph could be a laborious process, involving extensively cleaning the machine or, on newer models, replacing the drum or rollers, and then running the paper through the machine a second time, some fanzine publishers experimented with techniques for painting several colors on the pad. In addition, mimeographs were used by many resistance groups during World War Two as
1326-531: A projectile driver, it had around six times the gas generation of an equal volume of black powder and produced less smoke and less heating. Artillery shells filled with gun cotton were widely used during the American Civil War , and its use was one of the reasons the conflict was seen as the "first modern war." In combination with breech-loading artillery , such high explosive shells could cause greater damage than previous solid cannonballs. During
1404-537: A specially formulated correction fluid , and retyping once it has dried. (Obliterine was a popular brand of correction fluid in Australia and the United Kingdom.) Stencils were also made with a thermal process, an infrared method similar to that used by early photocopiers. The common machine was a Thermofax . Another device, called an electrostencil machine, sometimes was used to make mimeo stencils from
1482-449: A typed or printed original. It worked by scanning the original on a rotating drum with a moving optical head and burning through the blank stencil with an electric spark in the places where the optical head detected ink. It was slow and produced ozone . Text from electrostencils had lower resolution than that from typed stencils, although the process was good for reproducing illustrations. A skilled mimeo operator using an electrostencil and
1560-416: A very coarse halftone screen could make acceptable printed copies of a photograph. During the declining years of the mimeograph, some people made stencils with early computers and dot-matrix impact printers . Unlike spirit duplicators (where the only ink available is depleted from the master image), mimeograph technology works by forcing a replenishable supply of ink through the stencil master. In theory,
1638-878: A way to print illegal newspapers and publications in countries such as Belgium . Duplicating machines Too Many Requests If you report this error to the Wikimedia System Administrators, please include the details below. Request from 172.68.168.226 via cp1108 cp1108, Varnish XID 225767847 Upstream caches: cp1108 int Error: 429, Too Many Requests at Thu, 28 Nov 2024 08:34:53 GMT Nitrocellulose ( C 6 H 8 (NO 2 ) 2 O 5 ) n (dinitrocellulose) ( C 6 H 7 (NO 2 ) 3 O 5 ) n (trinitrocellulose, pictured in structures above) Nitrocellulose (also known as cellulose nitrate , flash paper , flash cotton , guncotton , pyroxylin and flash string , depending on form)
SECTION 20
#17327828930421716-521: A young Italian studying law in London, who called his device the Papyrograph. Zuccato's system involved writing on a sheet of varnished paper with caustic ink, which ate through the varnish and paper fibers, leaving holes where the writing had been. This sheet – which had now become a stencil – was placed on a blank sheet of paper, and ink rolled over it so that the ink oozed through the holes, creating
1794-431: Is a highly flammable compound formed by nitrating cellulose through exposure to a mixture of nitric acid and sulfuric acid . One of its first major uses was as guncotton, a replacement for gunpowder as propellant in firearms. It was also used to replace gunpowder as a low-order explosive in mining and other applications. In the form of collodion it was also a critical component in an early photographic emulsion,
1872-429: Is an ancient art, but – through chemistry, papers, and presses – techniques advanced rapidly in the late nineteenth century: A description of the Papyrograph method of duplication was published by David Owen: A major beneficiary of the invention of synthetic dyes was a document reproduction technique known as stencil duplicating. Its earliest form was invented in 1874 by Eugenio de Zuccato,
1950-535: Is backed by a sheet of stiff card stock, with the two sheets bound at the top. Once prepared, the stencil is wrapped around the ink-filled drum of the rotary machine. When a blank sheet of paper is drawn between the rotating drum and a pressure roller, ink is forced through the holes on the stencil onto the paper. Early flatbed machines used a kind of squeegee . The ink originally had a lanolin base and later became an oil in water emulsion. This emulsion commonly uses turkey-red oil (sulfated castor oil ) which gives it
2028-453: Is for the production of lacquers and coatings, explosives, and celluloid . In terms of lacquers and coatings, nitrocellulose dissolves readily in organic solvents, which upon evaporation leave a colorless, transparent, flexible film. Nitrocellulose lacquers have been used as a finish on furniture and musical instruments. Guncotton, dissolved at about 25% in acetone , forms a lacquer used in preliminary stages of wood finishing to develop
2106-431: Is less prone to stretching than other available plastics. By the late 1990s, polyester had almost entirely superseded triacetate for the production of intermediate elements and release prints. Triacetate remains in use for most camera negative stocks because it can be "invisibly" spliced using solvents during negative assembly, while polyester film is usually spliced using adhesive tape patches, which leave visible marks in
2184-435: Is much more resistant to polymer degradation than either nitrate or triacetate. Although triacetate does not decompose in as dangerous a way as nitrate does, it is still subject to a process known as deacetylation, often nicknamed "vinegar syndrome" (due to the acetic acid smell of decomposing film) by archivists, which causes the film to shrink, deform, become brittle and eventually unusable. PET, like cellulose mononitrate,
2262-434: Is not a nitro compound , but a nitrate ester . The glucose repeat unit (anhydroglucose) within the cellulose chain has three OH groups, each of which can form a nitrate ester. Thus, nitrocellulose can denote mononitrocellulose , dinitrocellulose , and trinitrocellulose , or a mixture thereof. With fewer OH groups than the parent cellulose, nitrocelluloses do not aggregate by hydrogen bonding . The overarching consequence
2340-494: Is soluble in a mixture of ethanol and ether until nitrogen concentration exceeds 12%. Soluble nitrocellulose, or a solution thereof, is sometimes called collodion . Guncotton containing more than 13% nitrogen (sometimes called insoluble nitrocellulose) was prepared by prolonged exposure to hot, concentrated acids for limited use as a blasting explosive or for warheads of underwater weapons such as naval mines and torpedoes . Safe and sustained production of guncotton began at
2418-459: Is that the nitrocellulose is soluble in organic solvents such as acetone and esters; e.g., ethyl acetate , methyl acetate , ethyl carbonate . Most lacquers are prepared from the dinitrate, whereas explosives are mainly the trinitrate. The chemical equation for the formation of the trinitrate is The yields are about 85%, with losses attributed to complete oxidation of the cellulose to oxalic acid . The principal uses of cellulose nitrate
Mimeograph - Misplaced Pages Continue
2496-731: The Edison Company at another location on December 9, at its film-processing complex in West Orange, New Jersey . That catastrophic fire started inside a film-inspection building and caused over $ 7,000,000 in property damages ($ 213,000,000 today). Even after film technology changed, archives of older films remained vulnerable; the 1965 MGM vault fire burned many films that were decades old. The use of volatile nitrocellulose film for motion pictures led many cinemas to fireproof their projection rooms with wall coverings made of asbestos . Those additions intended to prevent or at least delay
2574-598: The Paris Exhibition of 1889 . Commercial production started in 1891, but the result was flammable and more expensive than cellulose acetate or cuprammonium rayon. Because of this predicament, production ceased early in the 1900s. Nitrocellulose was briefly known as "mother-in-law silk". Frank Hastings Griffin invented the double-godet, a special stretch-spinning process that changed artificial silk to rayon, rendering it usable in many industrial products such as tire cords and clothing. Nathan Rosenstein invented
2652-574: The Waltham Abbey Royal Gunpowder Mills in the 1860s, and the material rapidly became the dominant explosive, becoming the standard for military warheads, although it remained too potent to be used as a propellant. More-stable and slower-burning collodion mixtures were eventually prepared using less concentrated acids at lower temperatures for smokeless powder in firearms . The first practical smokeless powder made from nitrocellulose, for firearms and artillery ammunition,
2730-482: The billiards industry offered a US$ 10,000 prize to whoever came up with the best replacement for ivory billiard balls . John Wesley Hyatt created the winning replacement, which he created with a new material he invented, called camphored nitrocellulose—the first thermoplastic , better known as celluloid . The invention enjoyed a brief popularity, but the Hyatt balls were extremely flammable, and sometimes portions of
2808-461: The "spunize process" by which he turned rayon from a hard fiber to a fabric. This allowed rayon to become a popular raw material in textiles. Nitrocellulose lacquer manufactured by (among others) DuPont , was the primary material for painting automobiles for many years. Durability of finish, complexities of "multiple stage" modern finishes, and other factors including environmental regulation led manufacturers to choose newer technologies. It remained
2886-664: The Bronx. On May 13, a fire at Universal Pictures ' Colonial Hall "film factory" in Manhattan consumed another extensive collection. Yet again, on June 13 in Philadelphia, a fire and a series of explosions ignited inside the 186-square-meter (2,000-square-foot) film vault of the Lubin Manufacturing Company and quickly wiped out virtually all of that studio's pre-1914 catalogue. Then a second fire hit
2964-415: The budgets of many smaller theaters. In practice, though, this has not proved to be as much of a problem as was feared. Rather, with the increased use of automated long-play systems in cinemas, the greater strength of polyester has been a significant advantage in lessening the risk of a film performance being interrupted by a film break. Despite its self-oxidizing hazards, nitrate is still regarded highly as
3042-406: The chambering of the feed and takeup reels in thick metal covers with small slits to allow the film to run through them. The projector is additionally modified to accommodate several fire extinguishers with nozzles aimed at the film gate. The extinguishers automatically trigger if a piece of film near the gate starts to burn. While this triggering would likely damage or destroy a significant portion of
3120-532: The closely related but distinctly different spirit duplicator process were both used extensively in schools to copy homework assignments and tests. They were also commonly used for low-budget amateur publishing , including club newsletters and church bulletins. They were especially popular with science fiction fans, who used them extensively in the production of fanzines in the middle 20th century, before photocopying became inexpensive. Letters and typographical symbols were sometimes used to create illustrations, in
3198-439: The concentration of unreacted acid. In 1855, the first human-made plastic , nitrocellulose (branded Parkesine , patented in 1862), was created by Alexander Parkes from cellulose treated with nitric acid and a solvent. In 1868, American inventor John Wesley Hyatt developed a plastic material he named Celluloid , improving on Parkes' invention by plasticizing the nitrocellulose with camphor so that it could be processed into
Mimeograph - Misplaced Pages Continue
3276-428: The early 20th century were lost through this accelerating, self-catalyzed disintegration or through studio warehouse fires, and many others were deliberately destroyed specifically to avoid the fire risk. Salvaging old films is a major problem for film archivists (see film preservation ). Nitrocellulose film base manufactured by Kodak can be identified by the presence of the word "nitrate" in dark letters along one edge;
3354-523: The early to mid 20th century for destroying or heavily damaging cinemas, inflicting many serious injuries and deaths, and for reducing to ashes the master negatives and original prints of tens of thousands of screen titles, turning many of them into lost films . Even when nitrate stock did not start the blaze, flames from other sources spread to large nearby film collections, producing intense and highly destructive fires. In 1914—the same year that Goodwin Film
3432-433: The favorite of hobbyists for both historical reasons and for the ease with which a professional finish can be obtained. Most automobile "touch up" paints are still made from lacquer because of its fast drying, easy application, and superior adhesion properties – regardless of the material used for the original finish. Guitars sometimes shared color codes with current automobiles. It fell out of favor for mass production use for
3510-417: The first World War , British authorities were slow to introduce grenades, with soldiers at the front improvising by filling ration tin cans with gun cotton , scrap and a basic fuse. Further research indicated the importance of washing the acidified cotton. Unwashed nitrocellulose (sometimes called pyrocellulose) may spontaneously ignite and explode at room temperature , as the evaporation of water results in
3588-400: The flatbed, which passed back and forth under inked rollers. This invention provided for more automated, faster reproductions since the pages were produced and moved by rollers instead of pressing one single sheet at a time. By 1900, two primary types of mimeographs had come into use: a single-drum machine and a dual-drum machine. The single-drum machine used a single drum for ink transfer to
3666-462: The frame area. However, ultrasonic splicing in the frame line area can be invisible. Also, polyester film is so strong, it will not break under tension and may cause serious damage to expensive camera or projector mechanisms in the event of a film jam, whereas triacetate film breaks easily, reducing the risk of damage. Many were opposed to the use of polyester for release prints for this reason, and because ultrasonic splicers are very expensive, beyond
3744-559: The inks are more resistant to ultraviolet light . The primary preservation challenge is the low-quality paper often used, which would yellow and degrade due to residual acid in the treated pulp from which the paper was made. In the worst case, old copies can crumble into small particles when handled. Mimeographed copies have moderate durability when acid-free paper is used. Gestetner , Risograph , and other companies still make and sell highly automated mimeograph-like machines that are externally similar to photocopiers. The modern version of
3822-625: The landing. Collodion, a solution of nitrocellulose, is used today in topical skin applications, such as liquid skin and in the application of salicylic acid , the active ingredient in Compound W wart remover. In 1832 Henri Braconnot discovered that nitric acid, when combined with starch or wood fibers, would produce a lightweight combustible explosive material, which he named xyloïdine . A few years later in 1838, another French chemist, Théophile-Jules Pelouze (teacher of Ascanio Sobrero and Alfred Nobel ), treated paper and cardboard in
3900-419: The launch of cellulose triacetate base film by Eastman Kodak in 1948. Cellulose triacetate superseded nitrate as the film industry's mainstay base very quickly. While Kodak had discontinued some nitrate film stocks earlier, it stopped producing various nitrate roll films in 1950 and ceased production of nitrate 35 mm motion picture film in 1951. The crucial advantage cellulose triacetate had over nitrate
3978-454: The mails without the need for fire safety precautions), the early generations of safety film base had two major disadvantages relative to nitrate: it was much more expensive to manufacture, and considerably less durable in repeated projection. The cost of the safety precautions associated with the use of nitrate was significantly lower than the cost of using any of the safety bases available before 1948. These drawbacks were eventually overcome with
SECTION 50
#17327828930424056-470: The making of stencils using a file plate, a grooved metal plate on which the stencil was placed which perforated the stencil when written on with a blunt metal stylus. The word mimeograph was first used by Albert Blake Dick when he licensed Edison's patents in 1887. Dick received Trademark Registration no. 0356815 for the term mimeograph in the US Patent Office. It is currently listed as
4134-511: The manufacture of guncotton were obtained by John Hall & Son in 1846, and industrial manufacture of the explosive began at a purpose-built factory at Marsh Works in Faversham, Kent , a year later. The manufacturing process was not properly understood and few safety measures were put in place. A serious explosion in July that killed almost two dozen workers resulted in the immediate closure of
4212-452: The meantime, George Eastman had already started production of roll-film using his own process. Nitrocellulose was used as the first flexible film base , beginning with Eastman Kodak products in August 1889. Camphor is used as a plasticizer for nitrocellulose film, often called nitrate film. Goodwin's patent was sold to Ansco , which successfully sued Eastman Kodak for infringement of
4290-455: The migration of flames beyond the projection areas. A training film for projectionists included footage of a controlled ignition of a reel of nitrate film, which continued to burn even when fully submerged in water. Once burning, it is extremely difficult to extinguish. Unlike most other flammable materials, nitrocellulose does not need a source of air to continue burning, since it contains sufficient oxygen within its molecular structure to sustain
4368-481: The mimeography process could be continued indefinitely, especially if a durable stencil master were used (e.g. a thin metal foil). In practice, most low-cost mimeo stencils gradually wear out over the course of producing several hundred copies. Typically the stencil deteriorates gradually, producing a characteristic degraded image quality until the stencil tears, abruptly ending the print run. If further copies are desired at this point, another stencil must be made. Often,
4446-470: The outer shell would explode upon impact. An owner of a billiard saloon in Colorado wrote to Hyatt about the explosive tendencies, saying that he did not mind very much personally but for the fact that every man in his saloon immediately pulled a gun at the sound. The process used by Hyatt to manufacture the billiard balls, patented in 1881, involved placing the mass of nitrocellulose in a rubber bag, which
4524-399: The patent and was awarded $ 5,000,000 in 1914 to Goodwin Film. Disastrous fires related to celluloid or "nitrate film" became regular occurrences in the motion picture industry throughout the silent era and for many years after the arrival of sound film . Projector fires and spontaneous combustion of nitrate footage stored in studio vaults and in other structures were often blamed during
4602-530: The plant. Guncotton manufacture ceased for over 15 years until a safer procedure could be developed. The British chemist Frederick Augustus Abel developed the first safe process for guncotton manufacture, which he patented in 1865. The washing and drying times of the nitrocellulose were both extended to 48 hours and repeated eight times over. The acid mixture was changed to two parts sulfuric acid to one part nitric. Nitration can be controlled by adjusting acid concentrations and reaction temperature. Nitrocellulose
4680-544: The projector's components, it would contain a fire and prevent far greater damage. Projection rooms may also be required to have automatic metal covers for the projection windows, preventing the spread of fire to the auditorium . Today, the Dryden Theatre at the George Eastman Museum is one of a few theaters in the world that is capable of safely projecting nitrate films and regularly screens them to
4758-544: The public. The BFI Southbank in London is the only cinema in the United Kingdom licensed to show Nitrate Film. The use of nitrate film and its fiery potential were certainly not issues limited to the realm of motion pictures or to commercial still photography. The film was also used for many years in medicine, where its hazardous nature was most acute, especially in its application to X-ray photography. In 1929, several tons of stored X-ray film were ignited by steam from
SECTION 60
#17327828930424836-459: The same way. Jean-Baptiste Dumas obtained a similar material, which he called nitramidine . Around 1846 Christian Friedrich Schönbein , a German-Swiss chemist, discovered a more practical formulation. As he was working in the kitchen of his home in Basel , he spilled a mixture of nitric acid (HNO 3 ) and sulfuric acid (H 2 SO 4 ) on the kitchen table. He reached for the nearest cloth,
4914-399: The stencil directly. The impact of the type element displaces the coating, making the tissue paper permeable to the oil -based ink . This is called "cutting a stencil". A variety of specialized styluses were used on the stencil to render lettering, illustrations, or other artistic features by hand against a textured plastic backing plate. Mistakes were corrected by brushing them out with
4992-581: The stencil material covering the interiors of closed letterforms (e.g. a , b , d , e , g , etc.) would fall away during continued printing, causing ink-filled letters in the copies. The stencil would gradually stretch, starting near the top where the mechanical forces were greatest, causing a characteristic "mid-line sag" in the textual lines of the copies, that would progress until the stencil failed completely. The Gestetner Company (and others) devised various methods to make mimeo stencils more durable. Compared to spirit duplication, mimeography produced
5070-415: The stencil, and the dual-drum machine used two drums and silk-screens to transfer the ink to the stencils. The single drum (example Roneo) machine could be easily used for multi-color work by changing the drum – each of which contained ink of a different color. This was spot color for mastheads. Colors could not be mixed. The mimeograph became popular because it was much cheaper than traditional print – there
5148-446: The stock is more transparent than replacement stocks, and older films used denser silver in the emulsion. The combination results in a notably more luminous image with a high contrast ratio. The solubility of nitrocellulose was the basis for the first " artificial silk " by Georges Audemars in 1855, which he called " Rayon ". . However, Hilaire de Chardonnet was the first to patent a nitrocellulose fiber marketed as "artificial silk" at
5226-416: The use of which revolutionized photography in the 1860s. In the 20th century it was adapted to automobile lacquer and adhesives . The process uses a mixture of nitric acid and sulfuric acid to convert cellulose into nitrocellulose. The quality of the cellulose is important. Hemicellulose , lignin , pentosans , and mineral salts give inferior nitrocelluloses. In precise chemical terms, nitrocellulose
5304-489: The word only in clear letters on a dark background indicates derivation from a nitrate base original negative or projection print, but the film in hand itself may be a later print or copy negative, made on safety film. Acetate film manufactured during the era when nitrate films were still in use was marked "Safety" or "Safety Film" along one edge in dark letters. 8 , 9.5 , and 16 mm film stocks, intended for amateur and other nontheatrical use, were never manufactured with
5382-771: Was awarded $ 5,000,000 from Kodak for patent infringement—nitrate film fires incinerated a significant portion of the United States' early cinematic history. In that year alone, five very destructive fires occurred at four major studios and a film-processing plant. Millions of feet of film burned on March 19 at the Eclair Moving Picture Company in Fort Lee, New Jersey . Later that same month, many more reels and film cans of negatives and prints also burned at Edison Studios in New York City, in
5460-683: Was blamed for the Dromcolliher cinema tragedy in County Limerick in which 48 people died. Then in 1929 at the Glen Cinema in Paisley, Scotland , a film-related fire killed 69 children. Today, nitrate film projection is rare and normally highly regulated and requires extensive precautions, including extra health-and-safety training for projectionists. A special projector certified to run nitrate films has many modifications, among them
5538-408: Was discontinued for motion-picture films in favour of cellulose acetate film , more commonly known as "safety film". Nitrocellulose was found to gradually decompose, releasing nitric acid and further catalyzing the decomposition (eventually into a flammable powder). Decades later, storage at low temperatures was discovered as a means of delaying these reactions indefinitely. Many films produced during
5616-615: Was invented by French chemist Paul Vieille in 1884. Jules Verne viewed the development of guncotton with optimism. He referred to the substance several times in his novels. His adventurers carried firearms employing this substance. In his From the Earth to the Moon , guncotton was used to launch a projectile into space. Because of their fluffy and nearly white appearance, nitrocellulose products are often referred to as cottons, e.g. lacquer cotton, celluloid cotton, and gun cotton. Guncotton
5694-442: Was neither typesetting nor skilled labor involved. One individual with a typewriter and the necessary equipment became their own printing factory, allowing for greater circulation of printed material. The image transfer medium was originally a stencil made from waxed mulberry paper . Later this became an immersion-coated long-fiber paper, with the coating being a plasticized nitrocellulose . This flexible waxed or coated sheet
5772-441: Was originally made from cotton (as the source of cellulose) but contemporary methods use highly processed cellulose from wood pulp . While guncotton is dangerous to store, the hazards it presents can be minimized by storing it dampened with various liquids, such as alcohol. For this reason, accounts of guncotton usage dating from the early 20th century refer to "wet guncotton." The power of guncotton made it suitable for blasting. As
5850-425: Was that it was no more of a fire risk than paper (the stock is often referred to as "non-flam": this is true—but it is combustible, just not in as volatile or as dangerous a way as nitrate), while it almost matched the cost and durability of nitrate. It remained in almost exclusive use in all film gauges until the 1980s, when polyester / PET film began to supersede it for intermediate and release printing. Polyester
5928-438: Was then placed in a cylinder of liquid and heated. Pressure was applied to the liquid in the cylinder, which resulted in a uniform compression on the nitrocellulose mass, compressing it into a uniform sphere as the heat vaporized the solvents. The ball was then cooled and turned to make a uniform sphere. In light of the explosive results, this process was called the "Hyatt gun method". An overheated container of dry nitrocellulose
6006-555: Was then slowly dried at a temperature below 40 °C (104 °F). Schönbein collaborated with the Frankfurt professor Rudolf Christian Böttger , who had discovered the process independently in the same year. By coincidence, a third chemist, the Brunswick professor F. J. Otto had also produced guncotton in 1846 and was the first to publish the process, much to the disappointment of Schönbein and Böttger. The patent rights for
6084-484: Was used by Copenhagen Suborbitals on several missions as a means of jettisoning components of the rocket/space capsule and deploying recovery systems. However, after several missions and flights, it proved not to have the desired explosive properties in a near vacuum environment. In 2014, the Philae comet lander failed to deploy its harpoons because its 0.3 grams of nitrocellulose propulsion charges failed to fire during
#41958