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 175
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. … Fig. 284. If we place the plane at right angles to the aperture, weobtain the hyperhola, Fig. 285. By adjusting the positions of the candle, aperture, and plane,
Geometrical drawing
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