[Electric engineering.] . the volt-meter to decrease the voltmeter reading by an amountproportional to the drop in the line as the load attendant then increases the held excitation of thealternator and thus brings the pressure up to such anamount that the voltage at the distributing point is cor-rect. Fig. 24 shows the general appearance of the West-inghouse compensator, and Fig. 25 shows how it is usedin connection with the voltmeter. It consists of a small 20 ELECTRIC LIGHTING. 17 transformer, the primary of which is divided into a numberof sections with leads brought out to te
[Electric engineering.] . the volt-meter to decrease the voltmeter reading by an amountproportional to the drop in the line as the load attendant then increases the held excitation of thealternator and thus brings the pressure up to such anamount that the voltage at the distributing point is cor-rect. Fig. 24 shows the general appearance of the West-inghouse compensator, and Fig. 25 shows how it is usedin connection with the voltmeter. It consists of a small 20 ELECTRIC LIGHTING. 17 transformer, the primary of which is divided into a numberof sections with leads brought out to terminal blocks R, S, T,etc., Fig. 24. The secondary is also divided into a numberof sections with terminals brought to the contact points1, 2, 3, etc. The voltmeter is of the ordinary coil-and-plunger type with a small auxiliary coil c, Fig. 25, woundover the main coil d. The main coil is supplied with currentfrom the potential transformer T in the ordinary way. Theprimary of the compensator is connected in series with the. 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
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