Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833- · New York, T. Audel · leaf 19
n a wire carrying a current is heldover or under it, the needle being turned in one direction in thefirst instance, and in the opposite direction for the second posi-tion of the vnre. The earths magnetism naturally holds the compass needlenorth and south. The magnetic field encircling the wire,… … Fig. 511.—Connections of single coil astatic needles. The coil surrounds the lower needleand the direction of the current between the two needles tends to turn them the same way. of the fact that the earths magnetism does exert some forcetending to hold the needle north and south, it is evident…
Electrical engineering
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