. Bulletin. Science. [ I I I 1 I. I I I I MDiBimitr* Figure 17.—Serrin's modele Suisse arc-light regulator. From Bulletin de la Societe d'En- couragement pour PIndustrie Nationale, 1861, vol. 8, pi. 234. could electrolyze water and was a great improve- ment over Faraday'; In the month following his Sorbonne demon- stration Ampere reported how Pixii had built a much larger generator than before and had modified Ampere's commutator switch so that it could be 2- Jean N. P. Hachette, "Nouvelle Construction d'une ma- chine electromagnetique," Annates de chimie et de physique, 1832,
. Bulletin. Science. [ I I I 1 I. I I I I MDiBimitr* Figure 17.—Serrin's modele Suisse arc-light regulator. From Bulletin de la Societe d'En- couragement pour PIndustrie Nationale, 1861, vol. 8, pi. 234. could electrolyze water and was a great improve- ment over Faraday'; In the month following his Sorbonne demon- stration Ampere reported how Pixii had built a much larger generator than before and had modified Ampere's commutator switch so that it could be 2- Jean N. P. Hachette, "Nouvelle Construction d'une ma- chine electromagnetique," Annates de chimie et de physique, 1832, vol. 50, pp. 322-324, and "De I'Action chimique produite par rinduction electrique; decomposition de I'eau," Annates de chimie et de physique, 1832, vol. 51, pp. 12-1 A; Charles Jackson, "Notice of the Revolving Electric Magnet of Mr. Pixii of Paris," American Journal of Science, 1833, vol. 24, pp. 146-147; Gehler's physikatisches Woerterbuch, Leipzig, 1836, new ed., Band 6/2, pp. 1177-1180. used with the generator (fig. 22).^^ A cam on the axis of the armature actuated the commutator that reversed the directions of the alternations at the appropriate time so as to obtain a more or less unidi- rectional current. The magneto now provided a current similar to that from the chemical cell, and the gases resulting from the electrolysis of water were in the correct proportions. Since it was also possible to rotate the coils making up the armature and to keep the magnets stationary, such modifications soon appeared. One of the first of these was described in a report given by the Rev. William Ritchie in March 1833 on a magnetoelectric generator (fig. 23) that he had worked out during the previous ^ Ritchie's armature, in the form of a disk that rotated about an axis perpendicular to its plane, consisted of four coils, 90° apart, that were mounted between two wheels with the axes of the coils parallel to the axis of the supporting wheels. When the armatu
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