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Scientific American, Vol. 87, No. 24 (1902) (1902)
leaf 19
serve both as common types of interlocking are no doubt familiar the horizontal or stop position a red glass comes in home or positive signal and also as a distant or cau- to the reader. Fig. 6 shows a part of the ‘“lead-out” front of the light, giving the stop indication. On a and connections of… … The disk signal is worked of the track. The completion of the movement of a switch wholly by the power of the is made to convey an electrical electro-magnet, requiring no BLOCK AND INTERLOCKING SIGNALS. © 1902 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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