Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 399
Fig. 879. Fig. 880. The safest and simplest way is to put a blank flange on below the valve andwith a force pump inject water to certain pressure, as shown by a steam gauge;balance this pressure by a weight P on the lever^and mark its distance fromthe fulcrum, which will give the weight per square…
Mechanical drawing
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