The boy spy; : a substantially true record of events during the war of the rebellion. The only practical history of war telegraphers in the field .. thrilling scenes of battles, captures and escapes / by Major J. O. Kerbey..
Publication Info.
Chicago ; New York [etc.] : Belford, Clarke & co., 1889.
Kerbey's bookℓThe Boy Spy describes an often overlooked aspect of espionage: the transmission of coded messages. He details the "history of war telegraphers in the field" and provides "a full account of the mysteries of signalling by flags, torches, and rockets."ℓ