o linesoa and olh^ tangent to the base of the cone, and these will bethe shadows of the two shade elements. We now see that oaand ob are the dividing lines between the light and dark sur-faces, but since these lines do not coincide with the contourelements od and oc, it is evident that neither od… … SHADOWS. 105 Do not shade the contour elements of a cylinder or cone. 101. We have seen that to find the shadow of a body threethings must be given, the body casting the shadow, the surfacereceiving the shadow, and the ray of light, and that these mustbe given by their projections. The surface…
Mechanical drawing
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