. The street railway review . thing that most roadswould have to buy would be the low reading voltmeter.To test the resistance of any one of the coils of a motora current is passed through it (the quantity being meas-ured by the ammeter) and the difference of potentialbetween the terminals of the coil is noted with the lowreading voltmeter. Then, according to Ohms law the^resistance of the coil is equal to the voltage at the ter-minals of the coil divided by the current in amperes.This being a simple case of division in arithmetic theresistance in ohms is calculated by the shop men for each. C
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. The street railway review . thing that most roadswould have to buy would be the low reading voltmeter.To test the resistance of any one of the coils of a motora current is passed through it (the quantity being meas-ured by the ammeter) and the difference of potentialbetween the terminals of the coil is noted with the lowreading voltmeter. Then, according to Ohms law the^resistance of the coil is equal to the voltage at the ter-minals of the coil divided by the current in amperes.This being a simple case of division in arithmetic theresistance in ohms is calculated by the shop men for each. CAGE FOR INSTRUMENTS — INDIANAPOLIS SHOPS. test and put on the recorils. The great imjioitance ofthis resistance test lies in the fact that it discloses burned-out and short-circuited field coils which are apparentlyall right on the exterior and which are not grounded onthe frame. Short-circuited field coils are a prolificsource of burned-oul armatures, and hence. b strik-ing a blow at the field troubles, a very considerableportion of the armature trouble begins to disappear. Tobetter illustrate this, suppose we take as an example theexperience at Indianapolis at the time the nev system oftesting was put in service. Previous to the inaugurationof the system there were certain cars on the road thatcame in frequently with armature troubles. No soonerwould they be put in service after being repaired, thanback they would come to the shop for more attention.Indeed there was a certain ring of them that seemed tohave a monopoly of the repair shop. Mr. Niles experi-ence and knowledge told