. Bulletin. Science. Stdt VitMT F I c 2 ria?i in, Stetu/n. F I C . I . Figure 32.—Patent drawing of Millward's magneto generator, 1851. From British patent specification 13536, February 28, were redesigned for the production of alternating- current: one end of the coils on each armature was connected to the axis and the other was connected to an insulated sleeve on it (fig. 41). It was found that a greater amount of current was produced if the re- sistance of the coils were reduced by winding more turns in parallel on each of the 16 spools on the armature. Preliminary results from the n
. Bulletin. Science. Stdt VitMT F I c 2 ria?i in, Stetu/n. F I C . I . Figure 32.—Patent drawing of Millward's magneto generator, 1851. From British patent specification 13536, February 28, were redesigned for the production of alternating- current: one end of the coils on each armature was connected to the axis and the other was connected to an insulated sleeve on it (fig. 41). It was found that a greater amount of current was produced if the re- sistance of the coils were reduced by winding more turns in parallel on each of the 16 spools on the armature. Preliminary results from the new design were so encouraging that the first 5-disk machine constructed since 1856 was demonstrated at the Hotel des Invalides in the early spring of 1859.^^ Unlike Holmes' constant experimentation, no further changes in the design of the Alliance machine were made. The only modifications were in the number of disks in the machine, with six seeming to have been the largest practical number on a single arbor, although Jamin and Roger apparently used a 9-disk in 1868. '8 Bulletin de la Societe d'Encouragement pour ['Industrie Mationale, 1859, vol. 6, p. 189; Du Moncel, op. cit. (footnote 5), vol. 4, pp. 39^7; vol. 5, pp. 102-104. « Cosmos, 1860, vol. 17, p. 427. ^Annates telegraphiques, 1861, vol. 4, p. 84; 1862, vol. 5, pp. 505-520; Bulletin de la Societe pour V Encouragement de PIndustrie Rationale, 1861, vol. 8, pp. 181-182: Cosmos, 1861, vol. The Societe I'Alliance was sufficiently confident of its redesigned machine to consider public demon- strations, and Berlioz was very energetic in seeing that proper occasions were found. In the late fall of 1860 a combination of the Serrin regulator and the Alliance machine was tried on the Dauphin's steam frigate,*' and it proved successful "in spite of the size of the ; In the spring of 1861 two 6- disk machines driven by a 4-hp. steam engine were used for public illumination of the Arc de Triomphe at
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