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 283
circles on the exterior of the sphere ABDPC, and EF the planeof projection passing through the centre of the sphere, of whichP is the pole or centre of projection. Then ah is the projection of the circle AB, and cd. of thecircle CD on the plane of projection. 262 SOLID GEOMETRY HELICES. Peoblem 50.… … Fig. 65. parallel to aA. Bisect ac in 0. From 0 as centre, and radius0«, draw a circle, and divide it into any number of equal parts,e.g. eight; also divide the line aa into the same number ofequal parts, and draw lines parallel to aA. From the variouspoints in the plan draw lines at right angles…
Geometrical drawing
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