Spanton, J. Humphrey (John Humphrey) · London, Macmillan and Co., Limited; New York, The Macmillan Company · leaf 123
en an axis and two foci. An ellipse has two foci, as the points A and B, Fig, 220,and the sum of the radii from these two points is alwaysequal. Let A and B representtwo pins, and ABC a pieceof thread. The point of apencil is placed inside thethread at C and movedso as to keep the threadalways… … Fig. 220. no GEOMETRICAL DRAWING AND DESIGN. 157. To construct an ellipse by means of intersecting lines, the transverse diameter AB and the conjugate diameter CD being given. Draw the lines AB and CD bisecting each other at right angles in the point E (Prob. 5). Draw HK and FG parallel to AB,…
Geometrical drawing · Design · Drawing
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