Benjamin, Charles H[enry], 1856- [from old catalog] · New York, H. Holt and company · leaf 140
e end Smoved along the straight line SL.Then will a pencil attached to the TO AO center of W trace on the plane a Fig. 48; . r tractrix whose axis is SL, SCHIELES PIVOT. 115 In Fig. 49 let SW=lengthof string =r\ and let P be anypoint in the curve. Then it isevident that the tangent PQ tothe curve… … Fig. 49. dP = SWrdr (a) (dl—d$)sind Let the normal wear of the pivot be assumed to beproportional to this normal pressure and to the velocityof the rubbing surfaces, i. e. normal wear proportionalto pr, then is the vertical wear proportional to prsinB But is a constant, therefore the vertical sind…
Machine design
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