Science and art drawing : complete geometrical course ; consisting of plane and solid geometry, orthographic and isometric projection, projection of shadow's the principles of map projection, graphic arithmetic and graphic statics (1895)
Spanton, J. Humphrey (John Humphrey) · London : Macmillan · leaf 174
4^ Fig. 282. In Fig. 282 the plane is parallel to the aperture, so thesection obtained is a circle. … C^> FiR. 283. If the plane is placed obliquely to the aperture, as in Fig.283, the section obtained is an ellipse. 154 PRACTICAL PLANE GEOMETRY By placing the plane parallel to the side of the cone, as inFig. 284, the section gives the paraljola.
Geometrical drawing
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