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Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for ... draughtsmen .. (1897) Willson, Frederick Newton, 1855-1939 · Princeton, N.J., The author · leaf 41
111. 0 ^^©i^ei^a ^ 34 THEORETICAL AND PRACTICAL GRAPHICS. 112. As an exercise in concentric circles Fig. 73 will prove a good test of skill. It is a fairrepresentation of a gymnasium ring, the annular torus of mathematical works, and possessing … some remarkable jiroperties, chief among which is the fact that it is the only surface of revokition known from which circles can be cut by three different systems of planes.* ng-. 7-4. E^igr- vs. Fitr X, / TORUS \ / C/ la y \D Mechanical drawing · Lettering
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