Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 36
ment is to be operated. In theLTnited States insulators are almost invariably made of glass, while inEurope the use of porcelain insulators is common and they are alsonow being used in Canada. Iron wire was formerly used almostexclusively, but in later years hard drawn copper wire is… … MODERN LAND AND SUBMARINE TELEGRAPHY 17 hard drawn copper has about two per cent higher specific resistancethan soft annealed copper. The resistance of copper wire changesapproximately one-fourth of one per cent per degree Fahrenheit*,and for this reason the temperature of a circuit should always…
Electrical engineering
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