The American journal of science and arts . to the public, I am only selecting from the mul-titude of machines I have constructed, such forms as obviouslyeconomize a given galvanic power. A number of machineswherein the poles of the magnets were changed, and others wherethe poles were not changed, but both systems, the stationary andrevolving, were rendered magnetic and non magnetic at intervals,have been laid aside as not worth describing. Another formwherein the magnets were made to revolve and attracted by sta-tionary armatures is obviously defective, as will be readily seen byreferring to f
The American journal of science and arts . to the public, I am only selecting from the mul-titude of machines I have constructed, such forms as obviouslyeconomize a given galvanic power. A number of machineswherein the poles of the magnets were changed, and others wherethe poles were not changed, but both systems, the stationary andrevolving, were rendered magnetic and non magnetic at intervals,have been laid aside as not worth describing. Another formwherein the magnets were made to revolve and attracted by sta-tionary armatures is obviously defective, as will be readily seen byreferring to figure 3d, and supposing the systems reversed. If thearmatures were stationary, and the charged magnets revolving,the magnets would always be attracted by the nearest armature ;consequently the magnets would be charged only during one halfof a revolution. Figures 1, 2, and 3, are modifications on a largescale of the revolving armature described in No. 2, of the last vol-ume of this Journal. In figure 1, h b, are two Electro Magnets Fig. disposed at right angles to each other, and firmly secured towooden pillars. Where it is practicable, the magnets should be Electro Magnetism. 351 supported by wood, as every piece of metal of any kind surround-ing a magnet, detracts from its action, by reason of closed cur-rents excited by the disturbance of magnetic forces. For the ac-tion of closed currents see Vol. xxxv. No. 2, pages 254 and armature «, is mounted upon a brass shaft e, as I have here-tofore shown by experiment that an iron or steel shaft detractsgreatly from the inductibility of the armature. At e, firmly secur-ed to the shaft is the electrotome or cut-oflf, the black portionsrepresenting the intersections of ivory or other non conductingmaterial. Two pairs of plates (compound series) are connectedby their poles with the cups p p. By the revolution of the arma-ture the two magnets are charged in succession, and thus theaction is maintained during the entire revolut
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