Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 66
a*- Likewise the V projection of the pointwill be in HP, as r, and the P projection will be in VV, as w,. Now let the operation of Fig. 44 be performed. The front partof P, carrying the point m with it, will move toward left throughan arc of 90°, stopping at n. This shows the significance of thearc… … Fig. 46 are rotated into H, the point a describes another quarter circle,whose plane is perpendicular to HA. It is shown by the linena. In the case of the point d (fourth quadrant) the line odrepresents the arc of the second operation (as does na^ above),but this line is drawn in the opposite…
Geometry, Descriptive
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