Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity (1905)
American School (Chicago, Ill.) · Chicago : American School of Correspondence · leaf 368
their presence was indicated by thepassage of minute sparks in the gap formed between the ends. Here then was a complete apparatus for fulfilling the condi-tions of signaling through space without wires; luit many improve-ments were needed before an efficient system could be producedcapable of…
Electrical engineering
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
