Appleton's dictionary of machines, mechanics, engine-work, and engineering (1861)
Appleton, firm, publishers, New York. (1852, D. Appleton & Co.) · New York : D. Appleton · leaf 530
nd of thelever, which is done by the same handle: the lead is regulated by the degree of inclination of the par-allelogram, which might be changed by lengthening the lever on the reversing-shaft connected with thelower arm of the link, or by shifting it round on the shaft so as to throw the lower… … Variable expansive action has recently been extensively introduced in locomotives, and the whole ofthe various expedients for its accomplishment iperate either by altering the travel of the valve, or bythe introduction of superposed valves. The first mode is that adopted by Stephenson and Cabrey,…
Mechanical engineering
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