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 184
ECTIONS 163 edge of a tee-square. Take a piece of string equal in lengthto CD, fix one end at D and theother at E, which is the focus ofthe curve. If a pencil be heldagainst the string, and kepttight against the tee-square, itwill trace half a parabola onmoving the tee-square upwards.AB is the… … 299. F■5-— — Pkoblem 191. To draw an oval hy arcs of circles, its transverse diameter ABand its conjugate CD Icing given. Set off on AB the distance AE equal to half the conjugatediameter. Through E draw the line EG perpendicular to AB (Prob. 5). With E as centre, and EA as radius, draw the…
Geometrical drawing
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