Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 75
n the right hand in such a way that thefingers point in the direction in which the current is flowing in the wires,the thumb will point in the direction of the north pole of the helix {seeFig. 58). Similarly, if the sign of the poles is known, but the direction ofthe current unknown, the latter may… … ] C 1 [ A Fig. 60. Horseshoe Electromagnet,with Armature. Fig. 61. Showing Lines of Force inHorseshoe Electromagnet. helix), the fingers will pass around the coil in the direction in whichthe current is flowing. 60. The Electromagnet. If a core of soft iron be inserted inthe helix (Fig. 59), the…
Electrical engineering
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