[Electric engineering.] . Fig. 24. main circuit, as shown, and the secondary is connected tothe small auxiliary coil. When the voltage at the distribu-ting end of the line is at its correct value, the hand of thevoltmeter is at its mid-position. When the load increases,the current through the primary of the compensator alsoincreases; this, in turn, increases the current in the second-ary, which is so connected to the auxiliary coil that thecurrent in this coil opposes that in the main coil. The § 17 ELECTRIC LIGHTING. 21 result is that the hand on the voltmeter goes Dack, and thepressure must
[Electric engineering.] . Fig. 24. main circuit, as shown, and the secondary is connected tothe small auxiliary coil. When the voltage at the distribu-ting end of the line is at its correct value, the hand of thevoltmeter is at its mid-position. When the load increases,the current through the primary of the compensator alsoincreases; this, in turn, increases the current in the second-ary, which is so connected to the auxiliary coil that thecurrent in this coil opposes that in the main coil. The § 17 ELECTRIC LIGHTING. 21 result is that the hand on the voltmeter goes Dack, and thepressure must be raised to bring it up to its proper plugging in at different points on the primary and bysetting at different points on the secondary, the compensatormay be adjusted for operation on almost any of the circuitsordinarily met. After it is once set to suit the particular. Fig. 25. line on which it is to work, it requires no further are furnished with the instrument showing how toset it, and care must be taken in setting to insert the extraplug g, Fig. 24, before withdrawing the plug h already inuse, otherwise the circuit will be opened. 18. The Mershon Compensator.—The compensatordescribed in the last article answers very well for lines thathave little self-induction and that supply a lamp , however, the load is inductive, as, for example, a loadof motors or a load of motors and lamps, the reactance ofthe line may have a very great influence on the drop involtage, and if a compensator is to make the voltmeter giveindications that are at all accurate, it must compensate notonly for the ohmic drop in the line, but also for the dropdue to the reactance. The Mershon compensator, brought /. Ill—20 22 ELECTRIC LIGHTING. 17 out by the Westinghouse Company, is designed to accom-plish this. 19. The principle on which this compensa
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