Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 530
the motor by simply plunging theplates more or less. This form of battery has the additional advantages ofbeing more powerful for its size than any other and of beingvery easily cleaned and kept in order. It has, however, thedisadvantage of becoming exhausted in three or four hours,but this is… … Side Elevation, Partly in Section, of Simple Electric Motor—One-third Size. motor to run an ordinary foot lathe or two or three sewingmachines. If it is desirable to adapt the motor to a batteryof higher resistance, the armature and field magnet may be Fig. 495.
Physics · Lantern projection · Electric apparatus and appliances
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