History, theory, and practice of the electric telegraph
A technical handbook on telegraphy by American telegraph superintendent George B. Prescott, published in Boston by Ticknor and Fields in 1866 for operators, engineers and students. Wood engravings show relays, sounders, keys, battery jars and coils on plinths and baseboards, drawn in three-quarter view with fine hatching, plus schematic line diagrams and a hand feeding paper tape.
