Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 483
to make a conducting path from A to B andfrom I) to C. through springs which press against the sides. If the poles of a battery be connected with the points aand J. as in the diagram (Fig. 299). the direction of the cur- 472 IXLUCTIOX OF CUEREXTS. rent through any instrument, 6r. whose electrodes… … FIG, 298. FIG. 299. Another form of apparatus for securing reversal of a cur-rent at will, and known as Pohl*s commutator, is shown inFig. 300. The wires a. d are fastened to an insulatinghandle, and dip into mercury cups connected to A and I)respectively. Each of the other mercury cups is…
Physics
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