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 169
n condens-ing engines the cord is often attached directly to the air-pump levers. Engine-beams and parallel-motion levers often offer similar facilities. For large engines, used on sea and land, permanentlevers are erected and kept in motion; a pin on a lever or a hook on the end of a sliding rod… … INDICATOR. 159 similar to that shown in Fig. 2414. A cord is attached to the engine cross-head and led back, paral-lel with the piston-rod (over a leading pulley when necessary), to the larger diameter of the wheel,the string being kept tight and the wheel retracted by a coiled spring inside the…
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