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 28
earths magnetismand to move in a horizontal plane. The current is calculated as follows: amperes = H_x_ N tan X. (1) GA L VA NOME TERS 447 in which H = constant from table below;r = radius of coil;N = number of turns of coil;X = angle of deflection of needle. The constant H, given in the following… … Fig. 521.—Mechanical explanation of the tangent law. Construct an apparatus as shown in thefigure. The short wooden block, NS, represents the magnetic needle. This fiece of woodturns around its center, C, which may be an ordinary nail. It will now be seen that twodifferent forces act upon N;…
Electrical engineering
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