Raymond, William Galt, 1859-1926, Raymond, William Galt, 1859-1926. cre · New York, J. Wiley & sons, inc · leaf 139
ty of three positions, and thegeneral English practice is to give two orders only. With disksignals the edge, or absence of the disk means track clear — goahead, while the broadside or appearance of the disk meansdanger — stop. The color scheme for lights at night varieson different roads. The… … TWO GENERAL DIVISIONS I I 5 The semaphore system is moved by power or by hand; if bypower, it is either compressed air acting in a cyHnder on a pistonwhich is connected to the signal by a rod, or compressed gas, orelectricity acting generally through a motor. The air is furnishedby a compressor…
Railroad engineering
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