The book Elementary Projection Drawing Theory And Practice was written by author S Edward Samuel Edward Warren Here you can read free online of Elementary Projection Drawing Theory And Practice book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Elementary Projection Drawing Theory And Practice a good or bad book?
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The circle og'o\ on oo' as a diameter, represents the same circle revolved about oo' as an axis and into the vertical plane of projection. Drawing a tangent to og'o' ^ l)arallul to DD', we find g\ a visible point of the curve of shade, whicli, when the circle revolves back to the position oo' ^ appears at J/, since, as the axis oo' is in the vertical plane, an arc, g'g^ described about that axis, must be ye?*^«ea//y projected as a straight line. (See An. Yi. ) In a precisely similar manner ai"e... found h.^ Jc, w?, and f. At A and B, rays are also evidently tangent to the sphere. Through A, y, «S:c. , to B the visible i)ortiou of the curve of shade may now be sketch''d. 192. The niost highly illuminated point is 90° distant fioin tli = \\ic chord of 90°, and revolve this ]jerpendicular circle back to the })osi»ion qq', when Q will be found ^t, r'.
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