Electrical news and engineering . h poles are formed at C C,south poles at C C. It will be seen that the poles revolveas with the 2-phase winding and we have what amountsto a rotating lield which drags the rotor around after it inexactly the same way as in the 2-phase Lighting Q.— In your October number you published a shortparagraph explaining how an automobile gasoline enginemay be started automatically by a motor-generator whichalso supplied the lighting for the automobile. Will youexplain something more in this connection about how auto-mobiles are lighted. A.—In general
Electrical news and engineering . h poles are formed at C C,south poles at C C. It will be seen that the poles revolveas with the 2-phase winding and we have what amountsto a rotating lield which drags the rotor around after it inexactly the same way as in the 2-phase Lighting Q.— In your October number you published a shortparagraph explaining how an automobile gasoline enginemay be started automatically by a motor-generator whichalso supplied the lighting for the automobile. Will youexplain something more in this connection about how auto-mobiles are lighted. A.—In general there are three systems from whichone may choose, (1) a storage battery alone, (2) a mag-neto and storage battery, (3) a generator and storagebattery. The first requires no explanation, the battery be-ing used in the ordinary way and requiring a charge everyso often from some outside source. In the second methoda magneto, which is in reality a low voltage gener-ator supplies current for lighting and also to the coil for. ignition purposes. A storage battery is also necessary inthis case to illuminate the car when it is standing unsatisfactory factor in this system is that the currentof the magneto cannot be utilized to charge the batteries,so that these must be charged also from some outsidesource. The third tiiethod would appear to be by far the mostsatisfactory. The storage battery floats on the feed linesleading out from the generator. The generator suppliesdirect current for lighting and also charges the batterywhen the car is running at a high rate of speed or duringsuch time as the lights are not required at all. Whenthe car is standing and the generator stopped the latteris disconnected from the lighting circuit which is fed bythe battery alone. It is a simple extension of this systemwhich is being used to start the gasoline engines, the gen-erators being run as motors by supplying them with cur-rent from the storage battery. What is a Rotary Converter
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