Modern electrical construction; a reliable, practical guide for the beginner in electrical construction, showing the latest approved methods of installing work of all kinds according to the safety rules of the National board of fire underwriters (1905)
Horstmann, Henry C[harles], 1858- [from old catalog], Tousley, Victor Hugo, 1875- [from old catalog] joint author · Chicago, F. J. Drake & Co. · leaf 73
the arm A is moved to the right, resist-ance is gradually cut out of the armature circuit until thearm reaches the last point, where it is automatically held in 70 MODERN ELECTRICAL CONSTRUCTION. position by means of the small magnet M, which is connectedin series with the held circuit. By tracing… … Figure 34 It will also be noticed that the last contact upon which thearm rests when off is dead. If the supply current for anyreason fails, current will cease to flow around the coils of themagnet M and it will become demagnetized, thus allowingthe arm A to fly back to the of¥ position. This…
Electrical engineering
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