Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 210
herwould interfere with the other, but both would transmittheir signals properly, one after the other, or successively.Thus, if a box is pulled while another is transmitting,the mechanism of the former would operate without MUNICIPAL TELEGRAPHS 195 afifecting the circuit until the Une is again… … Fig. 3. namely: plain boxes, which are devoid of the non-inter-fering and successive features, non-interfering boxes, whichhave not the successive feature, and successive boxes, whichare also non-interfering. The successive non-interferingtype of fire-alarm box represents the highest developmentof…
Telegraph
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