St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 142
Fig. 214. HOW LIGHT IS PRODUCED BY ARC LAMPS. 139 Fig. 208 shows the mechanism by which the carbonsare regulated. Fig. 209 shows a form of double carbon,or all-night lamp, one set of carbons being first used, the … Fig. 215. other set being automatically switched in at the propertime. Figs. 210, 211 show forms of shoj-t arc lamps, for useunder low ceilings, so common in basements, etc. Fig. 212 shows a hand-feed focussing type of arc lainp.In regular street lamps, the upper carbon onh is fed bymechanism, as…
Electricity
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