Spanton, J. Humphrey (John Humphrey) · London, Macmillan and Co., Limited; New York, The Macmillan Company · leaf 122
GEOMETRICAL DRAWING AND DESIGN. In Fig-. 215 the plane is parallel to the aperture, so the sectionobtained is a circle. … Fig. 216. Fig. 217. If the plane is placed obHquely to the aperture, as in Fig. 216,the section obtained is an ellipse. By placing the plane parallel to the side of the cone, as in Fig. 217, we get as sec-^^ tion, the parabola. If we place the planeat right angles to theaperture, we obtain…
Geometrical drawing · Design · Drawing
Internet Archive · Wellesley College Library · Public Domain Mark 1.0. Free to use for anything.
