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 26
placednear a conductor carrying acurrent of electricity, the directionof motion of the needle depend-ing upon the direction of flow ofthe current. From Fig. 3 and Fig. 4 it isseen that the lines of force pro-duced by the current in the con-ductor are concentric circles andtheir direction may be… … Fig. 4. Field about a Coil 18 PRINCIPLES
Electrical engineering
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