. Bulletin - United States National Museum. Science. Hoe & Co., of New York. Donkin's machine, employing a square "cylinder," which provided space for four flat forms of type, turned by "square" gears, and printing on a conjugate or complementary surface that revolved in contact with his polygonal "cylinder," produced 800 to 1,000 impressions per hour, but it was not economically In 1812 Donkin applied his talents to the preservation of food in tinplate canisters, or cans, and by 1814 he and his old master, Hall, were supplying canned soups and
. Bulletin - United States National Museum. Science. Hoe & Co., of New York. Donkin's machine, employing a square "cylinder," which provided space for four flat forms of type, turned by "square" gears, and printing on a conjugate or complementary surface that revolved in contact with his polygonal "cylinder," produced 800 to 1,000 impressions per hour, but it was not economically In 1812 Donkin applied his talents to the preservation of food in tinplate canisters, or cans, and by 1814 he and his old master, Hall, were supplying canned soups and meats to the Royal Like other fine mechanicians of his day, Donkin spent much time and energy in attempts to approach perfection in the fashioning of lead-screws for dividing engines, and the present chapter suggests his preoccupation with the He was active in the venerable Society of Arts and in the Institution of Civil Engineers, and while he had not by 1832 gained the status of fellow of the Royal Society—he became a fellow in 1838—it is clear that he was a man universally esteemed. The evidence favors the summing-up of his eulogist: "His life was one uninterrupted course of usefulness and good ; 155 152 The press is illustrated in British patent 3757, November 23, 1813, which was issued to Richard M. Bacon and Donkin; a perspective view is given in David Brewster's Edinburgh En- cyclopaedia (1832), vol. 18, pi. 469; and a schematic sketch of the arrangement is shown in A History oj Technology, (cited in note 140 above), vol. 5, p. 6go. Another Donkin printing press patent was no. 4202, January 17, 1818. 153 A History oj Technology, vol. 5, p. 39. 154 One of Donkin's dividing engines is in Science Museum, London. A description is in HoLTZAPFFEL, Turning and Mechanical Manipulation, 5 vols. (London, 1843-1884) vol. 2, pp. Figure 51.—Bryan Donkin (1768-1855). Portrait, 1829, courtesy of The Paper Maker, James L. A
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