Elementary lessons in electricity and magnetism (1906)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916, Schwetzky, Otto H. L. [from old catalog] · Chicago, Thompson & Thomas · leaf 364
carbonhav€ also been suggested by many inventors. Edison in1878 devised a lamp consisting of a platinum spiral com-bined with a short-circjiiting switch to divert the currentfrom the lamp in case it became overheated. More recentlythin filaments of carbon have been e^mployed by Swan,Edison,… … *»g-139. CHAP. VIL] ELECTRICITY AND MAGNETISM. 339 which they are sealed, the bulbs being afterwards ex-hausted of air and other gases, the vacuum being madevery perfect by the employment of special mercurialair-pumps. Carbon is better for this purpose thanplatinum or any other metal, partly…
Electricity · Magnetism
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