. Bulletin. Science. Figure 22.—Pixii magneto generator with Ampere's commutator, whiich is shown enlarged at the bottom of the figure. From H. W. Dove and L. Moser, Repertorium der Physik, Berlin, 1837, vol. i, pi. 2. by Daniel Davis, of Boston, beginning in the spring of ; Most of the preceding instruments of the 1830"s were essentially laboratory instruments constructed for experimental purposes. One of the earliest commercial applications of magneto generators was made by John S. Woolrich of Birmingham, England, in the following decade. In his patent application of 1841, Wo
. Bulletin. Science. Figure 22.—Pixii magneto generator with Ampere's commutator, whiich is shown enlarged at the bottom of the figure. From H. W. Dove and L. Moser, Repertorium der Physik, Berlin, 1837, vol. i, pi. 2. by Daniel Davis, of Boston, beginning in the spring of ; Most of the preceding instruments of the 1830"s were essentially laboratory instruments constructed for experimental purposes. One of the earliest commercial applications of magneto generators was made by John S. Woolrich of Birmingham, England, in the following decade. In his patent application of 1841, Woolrich described how Saxton generators could be modified for electroplating, and his method seemed feasible enough to be tried by the Elkington 26 Charles Page, "New Magnetic Electrical Machine of Great Power, with Two Parallel Horse-Shoe Magnets, and Two Straight Rotating Armatures, Affording Each, in an Entire Revolution, a Constant Current in the Same Direction," American Journal of Science, 1838, vol. 34, pp. 163-169; Daniel Davis, Manual oj Magnetism, Boston, 1847, ed. 2, pp. Figure 23.—Ritchie's magneto generator. The armature was shaped in the form of a disk, in which the coils (r) passed in succession between the poles of the magnet (M). The commutator is at ijgh. From William Ritchie, "Experimental Researches in Electro-Magnetism and Magneto-Elec- ; Philosophical Transactions, 1833, ^°1- 123, pi. 7 (opposite p. 316). firm in Birmingham, the same English firm that had already pioneered in ; Three years later Woolrich designed a more am- bitious generator (fig. 29) that was basically similar to Ritchie's. Coils and magnets were added to the Ritchie apparatus so that now a disk armature of eight uniformly spaced coils rotated between the poles of four magnets spaced 90° apart. The whole was built in a wooden framework that was 5 feet 4 inches high, 6 feet wide, and 2 feet deep. Faraday is said to have inspect
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