The American journal of science and arts . 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 inductibilit
The American journal of science and arts . 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 revolution. Fiff. Figure 2, exhibits a machine of more simple construction thanthe last, or perhaps than any other. It possesses also the advan-tage of straight magnets much preferable to the U magnet, h hare wooden frames or braces supporting the straight magnets m a are the two armatures upon the brass shaft e. The electro-tome constructed upon the same principle as that of figure 1 may 353 Electro Magnetism. be placed at e, and the wire connexions as before directed. Thisis at once a very beautiful and simple machine, but in order to re-alize its full power, the two straight magnets should be chargedby separate batteries. It cannot be made very large with anyeconomy, and the proportions should be very different from thoseseen in the figure ; the armatures should be much shorter thanthe magnets. Figure 3, represents a revolving armature machine, inventedin the month of March, 1838. Fig. 3.
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