Modern Practice of the Electric Telegraph: a Technical Handbook for ...
Modern Practice of the Electric Telegraph: a Technical Handbook for ...
Pope, Franklin Leonard, 1840-1895
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177. Magnetization Proportional to Ampere -turns. — An important principle in electro-magnetism is, that precisely the same magnetic effect may be obtained from a few turns of wire and a large volume of current as from a great number of turns and a small current, provided only that the number of ampere-turns remains the same. This necessarily follows from the fact that the same amount of work is done in the wire \ by the circuit in each case (92). 4.^* 178. The Magnetic Circuit. — In the practi...cal application of the electro-magnet for telegraphic and other like uses, it is not usual to make it in the form of a straight bar. Much better results are at- tained by bending the bar into the form of a (J> or "horseshoe," as shown in Fig. 65, which enables an armature to be applied to it in such *% . Fig. 65. Principle of Horseshoe Electro- a manner as to form a complete Magnet 11 For an experimental investigation of the relation between the diameter of the core, the total magnetizing force of the coil, and the force of attraction, see paper by E.
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