. Operation of trains and station work and telegraphy . easily made withoutthe use of tools and the attendant danger of short circuit. Adjustable Shunt.—In order to adjust the chargingcurrent delivered by the generator to the storage bat^tery, an adjustable shunt is provided which consists of a*number of steps of resistance enclosed in a small cast ironcase which is mounted inside the car and as near the,switch box as convenient. This shunt is connected acrossthe terminals of the series field of the bucker and servesto divert a certain portion of the charging current fromsaid field. A number o
. Operation of trains and station work and telegraphy . easily made withoutthe use of tools and the attendant danger of short circuit. Adjustable Shunt.—In order to adjust the chargingcurrent delivered by the generator to the storage bat^tery, an adjustable shunt is provided which consists of a*number of steps of resistance enclosed in a small cast ironcase which is mounted inside the car and as near the,switch box as convenient. This shunt is connected acrossthe terminals of the series field of the bucker and servesto divert a certain portion of the charging current fromsaid field. A number of binding posts are provided onthe shunt so that its resistance may be varied, which isdone by shifting one connecting wire from post to postuntil the proper adjustment has been secured and then HEATING AND LIGHTING CARS 201 the wire is made permanently fast. This shunt acts exactlylike the shunt on the series field of a compound genera-tor. It affords a simple and easy method of adjustmentand by its use the charging current can be varied about100%.. FIG. 96. ADJUSTABLE SHUNT. FIG. 97. EMERGENCYEXCITER SWITCH. Emergency Exciter Switch.—This switch consist-ing of a spring actuated lever turning upon two contactbuttons, provides a quick and certain method of excitingthe field of the generator directly from the storage bat-tery in case of loss of residual magnetism or any othercause preventing the generator from picking up. Ordi-narily the field circuit is completed through this switchso that the generator is self-exciting, but by throwingthe lever to the right, the field is connected directly tothe battery, and of course excited. Upon letting go ofthe lever, the spring restores the original switch may be shifted while the apparatus is at restor in motion .and its manipulation will not affect the ap-paratus in the slightest. 202 RULES FOR MOVEMENT OF TRAINS Junction Box.—To facilitate and simplify the wiringof the apparatus, a cast iron junction box has been
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadtrains, booky
