. The railroad and engineering journal . 8 and the pressure below the valve 9 opens it and admits steamto the pump. Question 656. How are the brake-cylinders and pistons con-structed? Answer. The construction of the brake-cylinders is shownin section by fig. 3S2. It is a simple cylinder with a piston, 8,which has leather packing. 9, and apiston-rod, 3. The pislon-rod, after being driven out by compressed air, is forced backagain by a spiral spring, 12, which is wound around the piston-rod. l86 THE RAILROAD AND [April, 1889. Fig.

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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887