Advanced mechanical drawing; by Jamison Alpha Pierce

Author:Jamison, Alpha Pierce. [from old catalog]
Language: eng
Format: epub
Tags: Mechanical drawing. [from old catalog]
Publisher: New York, J. Wiley & sons; [etc., etc.]
Published: 1905-03-25T05:00:00+00:00

Fig. 67.

of a point of sight, C distance in front of the vertical or picture plane, and D distance above the horizontal plane, and E distance to the right of the assumed point.

To find the perspective of the point imder the above conditions, and at the same time to keep the projections of the point out of the field of the picture, it is necessary to employ an auxiliary ground-line, Fig. 68, J5, delineating the usual arrangement. To execute this figure, with the field of the picture (that portion of the drawing surface to receive the picture) known, draw the ground-line and locate the point ^ (the vertical projection of the

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ADVANCED MECHANICAL DRAIVING,

point of sight), D distance above it; through ^ draw the horizon-line, and on it locate the distance point d/ [note that this is C distance to the left (may be either right or left) of 5' and represents or corresponds to the distance the point of sight is in front of or away from the picture plane]; next draw an auxiliary ground-line at any convenient point above the field of the picture and locate the horizontal projection or plan of the point B distance

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