Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 460
he Underground Trolley or Conduit System.—Previousto 1893 many patents were granted on conduit or other sub-surface systems of carrying the conductors for electric railroads,but it was not until after that year that capitalists began toexpend enough money to make a really successfully… … Ija^^u nnnnnn DDDDDn 1 OOQOOO J oooooo OOOOOO
Electrical engineering
Internet Archive · Brigham Young University · Public Domain Mark 1.0. Free to use for anything.
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