Roper's catechism for steam engineers and electricians .. (1899)
Roper, Stephen. [from old catalog], Keller, Edwin R., [from old catalog] ed, Pike, Clayton W., [from old catalog] ed · Philadelphia, D. McKay · leaf 153
ht of the lever by the distance of itscenter of gravity from the fulcrum; multiply the 132 ropers catechism for weight of the valve and stem by their distancefrom the fulcrum; add the last two products,deduct them from the first product, and dividethe remainder by the weight of the ball.… … A. Multiply the weight of the valve and stemin pounds by their distance from the fulcrum.Multiply the weight of the lever by the distanceof its center of gravity from the fulcrum. Multi-ply the weight of the ball by its distance from thefulcrum. Multiply the area of the valve by itsdistance from…
Steam engineering · Electrical engineering
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