Modern carpentry and joinery : being a compilation of the very best things and most modern and practical methods known in the arts of carpentry and joinery (1910)
Hodgson, Frederick Thomas, 1836- · Chicago : F. J. Drake & Co. · leaf 66
oints abed, in such a manner that the height of thepoint above the ground-line may be in constant rela-tion to the arcs a b, b c, c d; for example, that a may SOLID GEOMETRY 63 be the zero of height, that bb may be 1, c c 2, d d 3,&c.; then this curve is named a helix. To constructthis curve,… … so traced is independent of the cylinder on whichit has been supposed to be traced; and that if it beisolated, its horizontal projection will be a circle. Thehelix is named after the curve which is its horizontalprojection. Thus the helix in the example is a helixwith a circular base. The vertical…
Carpentry
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