The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 182
. Hence it will he seen, that to ascertain the position of any point H,when the line DE is wrapped round the cylinder, we have only towrap round the line LH ; this may easily be done by drawings an endview G, of the cylinder, and taking NP eijinl to LH, finding NH thelength of the curve equal to… … Fig. 2.—Let ABCn denote the outlines of the plan of the soffit of askew arch, and let EFG be drawn making the proper anglef with theface. Then by the plan I have just described, the line EG may be wrappedround the cylinder, and E FG the curve generated, will represent oneof the spiral courses. Now…
Architecture · Civil engineering · Science
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