. Bulletin. Science. d Figure 24.—Saxton's magneto generator. From Journal of the Franklin Institute, 1834, vol. 13, p. 155. Although Elkington felt that the magnetoelectric machine did not replace the voltaic cell, Woolrich, during the following decade, constructed similar machines (figs. 30, 31) for Elkington'^ and a fev,' other electroplating companies in Birmingham.^" In 1851, William Millward, of Birmingham, patented a ma- chine ^' (fig. 32) that was very similar to VVoolrich's. A few years later a more important application of the magnetoelectric machine was demonstrated— one that h
. Bulletin. Science. d Figure 24.—Saxton's magneto generator. From Journal of the Franklin Institute, 1834, vol. 13, p. 155. Although Elkington felt that the magnetoelectric machine did not replace the voltaic cell, Woolrich, during the following decade, constructed similar machines (figs. 30, 31) for Elkington'^ and a fev,' other electroplating companies in Birmingham.^" In 1851, William Millward, of Birmingham, patented a ma- chine ^' (fig. 32) that was very similar to VVoolrich's. A few years later a more important application of the magnetoelectric machine was demonstrated— one that had many implications for the future. Frederick H. Holmes showed, in 1853, that a magneto might be used to run an arc light, much to the sur- prise of the well known authority on electricity, E. Becquerel.^^ The latter subsequently declared that ^''Mechanics Magazine, 1849, vol. 51, pp. 271-272; Illustrated London News, October 2, 1852, vol. 21, p. 295. 3" Samuel Timmins, Birmingham and the Midland Hardware District, London, 1866, pp. 488-494. 31 British patent 13536 (February 28, 1851). 32 D. K. Clark, The Exhibited Machinery of 1862, London, 1864, pp. 286, 431; J. H. Gladstone, "Ligiitliouse Illumination by Magneto-Electricity," Qjiarterly Journal of Science, 1864, vol. 1, pp. 70-75; Les Mondes, 1864, vol. 4, pp. Figure 25.—Clarke's magneto generator. From Annals of Electricity, January 1837, vol. I, p. 146. "none but a fool or an Englishman would have be- lieved it ; After several years of experimentation. Holmes patented in 1856 a multiple disk armature machine consisting of many Woolrich generators mounted in a single frame (fig. 33).'' Instead of one disk armature that rotated between the poles of a single bank of permanent magnets. Holmes spun six disk armatures on a common axis between seven parallel banks of permanent magnets. Every other disk was dis- placed through a small angle so as to reduce the fluctuations of the to
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