A text book of elementary mechanics, for the use of colleges and schools (1881)
Dana, Edward Salisbury, 1849-1935 · New York, J. Wiley & sons · leaf 225
be marked off from it foreach unit of weight (e.g., 1 lb.) and fraction of it. Let AB (Fig. 138) be the steelyard, supported at C.Represent the weight of the whole by Q acting at thecentre of gravity G. In order that the bar shouldbalance horizontally about C when there is no weight 206 STATICS.… … Fig. 138. Fig. 139. Let now a weight W be placed on the hook so thatit acts through A) then the counterpoise P will balanceit at B, if (156) the moments about 0 vanish; that is, W.AC + Q.GC = P.CB; or, since Q.GC = P.CD, W.AC = P.CB - P.CD = P (CB - CD), or W.AC= P.DB, W.AC and DB = If W = 1 lb.,…
Mechanics
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