Phillips, Andrew Wheeler, 1844- [from old catalog] · [New York, Press of J. J. Little & co.] · leaf 9
and the sides of the parallelogram parallel toD C, are the same length as in the model. O E is inclined to D C 60°, and is drawn on the scale one half.The other lines, being neither parallel norperpendicular to the vertical plane of pro-jection, are not drawn to a scale, but sim-ply connect points… … Fig. 9. GEOMETRY.—COURSE B. cone and the horizontal section of the sphere may be drawn on thesame principle as the projection of the circle in Fig. 5. \ \ p \ B A y A Fig. 10. Fig. II. Figs. 10 and 11 are constructed on the principle that all lineseither parallel or perpendicular to the vertical…
Geometry
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