[Electric engineering.] . TRIC LIGHTING. 63 arrangements designed for this purpose. Two of the mostcommon are the lamp-board regulator and the so-calledC. R. regulator. 73. The Lamp-Board Regulator. — The principle ofthis regulator will be understood by referring to Fig. current is kept at its proper value simply bycutting in a lamp at thestation whenever one onthe circuit burns board, on which aremounted a number oflamps /, /, /, is placed inthe station, and the extralamps connected in serieswith the line through aswitch s and an amme-ter a. The ammeter in-dicates when the cur
[Electric engineering.] . TRIC LIGHTING. 63 arrangements designed for this purpose. Two of the mostcommon are the lamp-board regulator and the so-calledC. R. regulator. 73. The Lamp-Board Regulator. — The principle ofthis regulator will be understood by referring to Fig. current is kept at its proper value simply bycutting in a lamp at thestation whenever one onthe circuit burns board, on which aremounted a number oflamps /, /, /, is placed inthe station, and the extralamps connected in serieswith the line through aswitch s and an amme-ter a. The ammeter in-dicates when the currentis at its proper amount,and if a lamp on the linegoes out, the reading atonce increases. By mov-ing the handle of theswitch s, any number oflamps desired may be cutin and the current main-tained at its proper valueuntil the lineman is able to go around and replace thebroken lamps. The figure is only intended to show thegeneral principle of the lamp board; the actual arrangementof the parts varies in different To Dynamo. Fig. 38. To. Idne. 74. The C. R. Regulator.—This regulator was broughtout by the General Electric Company to replace the oldlamp-board method of regulation. In many cases it isdesirable to have some kind of regulator that will not only 64 ELECTRIC LIGHTING. 16 compensate for any lamps that may burn out, but that willalso allow a wide variation in the voltage applied to the cir-cuit. For example, we might wish to run a circuit having40 20-volt lamps from a 1,000-volt alternator. The seriesof lamps would only require 40 X 20 = 800 volts, and if thelamp board were used, 10 lamps would have to be insertedin the station to take up the extra 200 volts, neglecting thedrop in the line. This would be an expensive and wastefulmethod. The C. R. regulator is simply a special kind of trans-former that is so made that its secondary voltage may be added to or sub-tracted from that ofthe dynamo. Theoperation of this reg-ulator will be under-stood by referringto
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