Handbook for the use of electricians in the operation and care of electrical machinery and apparatus of the U. S. seacoast defenses .. (1904)
United States. War Dept · Washington, Govt. print. off. · leaf 187
tation rings off. 4. To illustrate the working of a board, itis oidv necessarv to take three line dro])s,/././■■. in fig. l78, two plugs, P and /,and twin wire cord 1 and 2,* one listeningkey. AT, akso one ringing key. A, whose but-ton l)eing pres.sed, throws the magneto, al-ways running on a large… … (ira\ity Orop. and joins one of 134 HANDBOOK FOR ELECTRICIANS. The insulated cylinder next the knob connects at the same time the otherconductor with the second main line to the station. 6. Suppose a call comes from station 1— The drop falls, displaying number 1 to the operator. She then inserts…
Electric machinery · Searchlights · Coast defenses
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
