St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 138
enough to heat theends red-hot. If the rodsbe separated slightly, thecurrent will continue toflow, as the intensely heatedair and flying particles ofcarbon reduce the resist-ance of the air-space. Fig. 206 shows two car-bon rods which are joinedto the two terminals of adynamo. The upper,… … 136 HOW LIGHT IS 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…
Electricity
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