. Bulletin. Science. Figure 52.—Watkins' motors. From Philo- sophical Magazine, 1838, vol. 12, pi. 4. to use his motor to drive a boat 28 feet long, 7)^ feet wide and dravi'ing If^ feet of water. ^^ Carrying a dozen or so officials of the Russian government, this boat moved at the speed of 1}^ miles an hour on the. Figure 53.—Jacobi's motor. From Sturgeon's Annals of Electricity, 1837, vol. i, pi. 13. Neva river. The following year, using the same motor, Jacobi found he could double the speed by using 64 Grove cells with the same electrode area. One suspects the fumes from the 64 cells probabl
. Bulletin. Science. Figure 52.—Watkins' motors. From Philo- sophical Magazine, 1838, vol. 12, pi. 4. to use his motor to drive a boat 28 feet long, 7)^ feet wide and dravi'ing If^ feet of water. ^^ Carrying a dozen or so officials of the Russian government, this boat moved at the speed of 1}^ miles an hour on the. Figure 53.—Jacobi's motor. From Sturgeon's Annals of Electricity, 1837, vol. i, pi. 13. Neva river. The following year, using the same motor, Jacobi found he could double the speed by using 64 Grove cells with the same electrode area. One suspects the fumes from the 64 cells probably contributed as much to the dropping of the project as did the breakdowns of the motor. The first inventor to build an electric motor able to perform useful work was probably Thomas Davenport, a blacksmith of Brandon, Vermont.^^ In 1833 Davenport was so fascinated by the operation of one of Henry's electromagnets that he bought one. By July 1834 he had worked out a motor with a 7-inch flywheel that rotated at a speed of 30 rpm. Using a shunt-wound motor for drive, Davenport built a motor on rails that is usually called his miniature "train" (fig. 54). He had applied for a patent on his electric motor in 1835, but the fire at the Patent Office in Washington destroyed his application 'Jacobi, op. cit. (footnote 52). 92 Franklin L. Pope, "Tfie Inventors of the Electric Motor," Electrical Engineer, 1891, vol. 11, pp. 1-5, 33-39, 65-71, 93-98, 125-130; Walter R. Davenport, Biography of Thomas Davenport, Montpelier, Vermont, 1929; Mary Somerville, Electromagnetism— History of Davenport's Invention of the Application of E'ectromagnetism to Machinery, New York, 1837. PAPER 28: DEVELOPMENT OF ELECTRICAL TECHNOLOGY IN THE 19TH CENTURY: I 263. 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 S
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