Various, Popular Science Monthly (1889)
“ On the military side of his functions, the Chief Signal-Officer records the steps he has taken to secure a suitable heliograph apparatus, the selection of field-glasses for army use, and experiments with homing pigeons. The inadequacy of the present methods to insure instruction in military signaling is lamented, with the declaration that "there is not an average of two officers to a regiment who are competent to transmit signals—by sun, flag, and torch—day and night, except those who have passed through a regular course of instruction in connection with this office." ”
