Describes experiments on Boston and Albany in Mass. and New York. An audible warning sounded in conjunction with visual indication given by three-position automatic semaphore. See also Ry. Elec. Engr., vol. 13, no. 3, Mar. 1922, pp. 97-98, 1 fig.
The federal signal company's audible signal
Ry. Age
Railway Age ; 72 , n 9
1922
2 pages
4 Figs.
Aufsatz (Zeitschrift)
Englisch
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