Warren, Samuel Edward, 1831-1909. [from old catalog] · New York, J. Wiley & sons · leaf 88
ri.vn. … SHADES AND SHADOWS. 45 Problem XX. To find the curve of shade on the common oblique helicoid, in thtpractical case of the threads of a triangular-threaded screw. 52. Principles.—Under this head are here arranged a few preliminary matters, which will prepare the way for attention to theimmediate…
Shades and shadows
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