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 565
acting upon the valve-lever so as to permit the escape of steam after it has raised the ham-mer to a sufficient height. P is the hammer fitted to the block by a wrought-iron key o. Q is thelatch-lever, p is a small solid piston working in a cylindrical part of the valve-chest, and attachedto the… … in Fig. 3383, unless counteracted by a superior force, q is the valve-spindle ; r, the valve-lever; s,the trigger, the function of which is to keep the steam-valve in such a position as to prevent theadmission of steam into the cylinder during the descent of the hammer-block ; t, the parallel bar…
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