St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 136
passing a current of too highpressure through it. Even with the proper current,lamps soon begin to deteriorate, assmall particles of carbon leave thefilament and cling to the glass.This is due to the evaporation,and it makes the filament smaller, and a higher pre.ssureis then needed to force the… … Fig. 201.
Electricity
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![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer03inte-576-347.webp)
