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
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, … Fig. 285. we can obtain a conic section to suit any required condition,both as to shape or size. A truncated cone or frustrum is the part of the cone belowsection A, Fig. 281. CONIC SECTIONS 155 The Ellipse. An ellipse has two unequal diameters or axes, wliicli are atriglit angles to each other.…
Geometrical drawing
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