Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 313
. opposite poles of the inner and outer coils are opposed. Thegeneral appearance of the machine is shown (Fig. 190), inwhich A represents the outer coil of wires, B one pole of the 294 Electricity. [Book III. fixed electro-magnet made by them, and C the commutatingarrangement by which the inner… … Fig. 191. Fig. 191 (ii) the commutator is shown in plan, the currentbeing transmitted to the inner coil through the springs F andG, which carry the friction rollers, working on the commu-tator E. The battery current enters at H, passes by F to E, throughthe inner coil back to the upper half of E,…
Electricity
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