Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 797
red with ordinary glass. Apparatus exists within the boxby which red or green targets or lights may be shown at will. Each side of the apparatus givessignals for one of the two tracks. The attendant gets a distant view on the line from the upperstory of the house, and finds in it a comfortable… … SIGNALS, RAILROAD. 765 some roads, at the bottom of a shaft which supports the disks is attached an arm, with a torpedo atits end. This arm swings simultaneously with the disk. If the disk stands at danger, that^is,perpendicularly to the line, the torpedo is placed on the top of the rail. The next…
Mechanical engineering -- Dictionaries
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![An illustration from Bicknell's village builder. Elevations and plans for cottages, villas, suburban residences, farm houses [etc.] also exterior and interior details for public and private buildings, with approved forms of contracts and specifications. Containing fifty-five plates drawn to scale (1872)](https://img.insideoutlibrary.com/img/200/ia-bicknellsvillage00bick-186-169.webp)
