St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 141
Fig. 210. Fig. 2ir. 138 HOW LIGHT IS PRODUCED BY ARC LAMPS. grip the upper carbon and pullit far enough above the lowerone to establish the arc. Assoon as the distance betweenthem gets too great again, thegrip on the upper carbon is%^ loosened, allowing the carbon todrop until it comes in…
Electricity
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