History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 516
is transmitting. The sounders B, B, B are the appa-ratus which in all the principal stations have taken the place of theregisters to read from. They are actuated by local batteries, L, L, L,which form circuits represented by the dotted lines. The local cir-cuits are broken and closed at the points… … ■198 THE PROGRESS OF THE ELECTRIC TELEGRAPH.
Telegraph
Internet Archive · Medical Heritage Library · Public Domain Mark 1.0. Free to use for anything.
