. Report of the geological exploration of the fortieth parallel . Figs I. Scale JT TBEATMEXT OF THE COMSTOOK OSES. 213 The proper curve of the face of the cam, in order that it may performthe desired duty with the least friction, is the involute of a circle, the radiusof which is equal to the distance between the center of the cam-shaft and thecenter of the stamp-stem. This produces a line for the face of the cam whichmeets, better than any other, the various requirements. The bottom of thetappet is constantly perpendicular to the radius of the curve of the cam; thetappet, and with it the stam
. Report of the geological exploration of the fortieth parallel . Figs I. Scale JT TBEATMEXT OF THE COMSTOOK OSES. 213 The proper curve of the face of the cam, in order that it may performthe desired duty with the least friction, is the involute of a circle, the radiusof which is equal to the distance between the center of the cam-shaft and thecenter of the stamp-stem. This produces a line for the face of the cam whichmeets, better than any other, the various requirements. The bottom of thetappet is constantly perpendicular to the radius of the curve of the cam; thetappet, and with it the stamp, is lifted vertically and uniformly, so that thelift of the stamp is always regularly proportioned to the revolution of thecam-shaft. The cam-curve may be constructed on paper by means of tangents, asshown in Fig. 6, Plate XX. If c represents the center of the cam-shaft, andc r the distance from the center of the cam-shaft to the center of the stamp-stem, the circle described about c, with c r as a radius, is the developing circleof the involute. The distance, repr
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