St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 139
PRODUCED BY ARC LAMPS. As the elecflric arc is extremely hot, metals are easilyvaporized in it; in fadl, even the carbon rods themselvesslowly melt and vaporize. This extreme heat is used formany industrial purposes. The phenomenon of the eledtric arc was first noticed byHumphrey Dav3 in iSoo, and…
Electricity
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