Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 241
e commandsare displayed by utilizing a distinctive color for each: thus,red is used as the danger signal, green generally as the clearsignal, and orange-yellow usually as the caution signal. 226 TELEGRAPH ENGINEERING Semaphores are either of the two-position or three-posi-tion type, the blade… … Yellow <^^ <^ v^ DISTANT SEMAPHORE \\ ^- -ACLEAR Fig. I. three-position signal is shown at B, and is mounted directlyalongside of the tracks, usually at interlocking plants.These three-position upper-quadrant signals indicate bytheir blade positions: danger when horizontal, cautionwhen…
Telegraph
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