. Bulletin. Science. Figure 55.—Patent Office model of Davenport's electric motor. (USNM 2^2644; Smithsonian bhoto 44gy8.). Figure 56.—Davidson's motor. From Electrical World, 1890, vol. 16, p. 277, fig. 2. Figure 57.—Davidson's electric locomotive. From T. du Moncel, Electricity as a Motive Power, London, 1883, fig. 32. and he had to apply again in February 1837^' (fig. 55). By August 1837 he had developed a motor with a 6- pound rotor, about half a foot across, that rotated at a speed of 1,000 rpm and that could raise a 200-pound weight at a speed of 1 foot per minute when driven by three ce
. Bulletin. Science. Figure 55.—Patent Office model of Davenport's electric motor. (USNM 2^2644; Smithsonian bhoto 44gy8.). Figure 56.—Davidson's motor. From Electrical World, 1890, vol. 16, p. 277, fig. 2. Figure 57.—Davidson's electric locomotive. From T. du Moncel, Electricity as a Motive Power, London, 1883, fig. 32. and he had to apply again in February 1837^' (fig. 55). By August 1837 he had developed a motor with a 6- pound rotor, about half a foot across, that rotated at a speed of 1,000 rpm and that could raise a 200-pound weight at a speed of 1 foot per minute when driven by three cells. Later in the year, he used this new ma- chine to run a drill and turn a piece of hard wood 3 inches in diameter on his lathe.^* Li an exhibition in »3 Thomas Davenport, "Specification of a Patent for the Application of Electro Magnetism to the Propelling of Ma- chinery," Journal of the Franklin Institute, 1837, vol. 20, pp. 340- 343. Patent 132, February 25, 1837. '< "Notice of the Electro-Magnetic Machine of Mr. Thomas Davenport of Brandon, Near Rutland, Vermont," American Journal of Science, 1837, vol. 32, appendix, pp. 1-8; aho Mechanics' Magazine, London, 1837, vol. 27, pp. 159, 204-207, 404-405, and letter from Thomas Davenport to editor, American Journal of Science, 1838, vol. 33, appendix, pp. 1-2. 264 BULLETIN 228: CONTRIBUTIONS FROM THE MUSEUM OF HISTORY AND TECHNOLOGY. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution; United States. Dept. of the Interior; United States National Museum. Washington, Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off
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