Modern practice of the electric telegraph : a handbook for electricians and operators
Frank L. Pope's technical handbook for telegraph electricians and operators, published in New York by D. Van Nostrand in 1874. The 52 wood engravings mix circuit diagrams of keys, relays and battery lines with shaded perspective views of sounders, registers and switchboards, offering designers labelled schematic linework, coil and magnet forms, and small hardware vignettes.
