An elementary book on electricity and magnetism and their applications . Fig. 17S. Motor-driven washing machineand wringer. Fig. 177.— Motor-driven com-pressor for small refrigerator. of church organs, drivingventilating fans in largebuildings, driving pumpsused in a great varietyof service, operating con-tractors hoists used inthe construction of largebuildings, operating min-ing machinery, and start-ing automobile list might be cx-1 ended indefinitely with-out exhausting the usesof electric motors. 256 ELECTRICITY AND MAGNETISM Figure 179 shows a motor-generator for a Dodge auto
An elementary book on electricity and magnetism and their applications . Fig. 17S. Motor-driven washing machineand wringer. Fig. 177.— Motor-driven com-pressor for small refrigerator. of church organs, drivingventilating fans in largebuildings, driving pumpsused in a great varietyof service, operating con-tractors hoists used inthe construction of largebuildings, operating min-ing machinery, and start-ing automobile list might be cx-1 ended indefinitely with-out exhausting the usesof electric motors. 256 ELECTRICITY AND MAGNETISM Figure 179 shows a motor-generator for a Dodge dynamo is connected with the gasolene engine by meansof a chain. When the engine is running, the dynamo acts asa generator and furnishes current for charging the storagebattery and operating the lights. When the engine is standingstill and is to be started, the dynamo serves as a motor, whichreceives current from the storage battery and starts the Fig. 179. — Self-starter on a Dodge automobile. 175. Motors and manufactories. The place above others,perhaps, in which electric motors have come to be very muchappreciated and widely used is in large manufactories. Theordinary method of carrying power through shops by meansof great belts and heavy shafts is very wasteful of power. Theattached table, taken from one in Professor Flathers book onpower measurements, shows the amount of power lost in belt-ing and shafting, and the amount actually delivered where itis required for use, for every hundred horse power developedby the engine. The table shows that from one fourth to fourfifths of the power of the engines ivas actually wasted, simply inmaking shafting revolve <m<l in causing the belts and gears to runwhere the old-fashioned main belts and shafts were used to distrib-ute the shop power. DIRECT-CURRENT MOTORS 257 Name op Works Power Lost,Per Cent Power Used,Per Cent Union Iron Works . ... 2332804041504931 7768206059505169
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmagnetism, bookyear19
