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 677
. 3603 represents two draw-heads when coupled; the hole in thecentre, through which the coupling link is seen, is a safety device to prevent injury to the hand ofthe brakeman during the coupling. Millers Safety Platform and Automatic Coupler is largely employed on American passenger cars.Fig. 3604… … RAILROAD CARS. 647 3604
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