Jamison, Alpha Pierce. [from old catalog] · New York, J. Wiley & sons; · leaf 66
on the vertical plane of projection\the line mn,-n, then, represents the true length of M-N. The conventional procedure is illustrated by Fig. 3. The lineM-N is assumed by its two projections m-n and mr-n, the hori-zontal and vertical projections respectively. To find the truelength by revolving… … 48 MECHANICAL DRAWING. to the horizontal plane, the vertical projection of the arc m-mis the straight line m-m, parallel to the ground line. Thepoint n, being used as a center of revolution, remains fixed, henceits vertical projection remains unchanged and the vertical pro-jection of the revolved…
Mechanical drawing
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