French, Arthur Willard, 1868-, Ives, Howard Chapin, 1878-1944. joint author · New York, J. Wiley & Sons. Inc.; London, Chapman & Hall, Limited · leaf 106
ial length. Remark.—The student may see the exact nature of a helix bycomparison with the thread of a screw. If the cylinder were sur-rounded with any number of spirals, all being similar and equal,the entire projection of a screw would be obtained. 146. Helicoidal Surface.—Now if we suppose a line… … Fig. 45. of the extrados of a right arch of thickness AF, the plan ofwhich is FHIJ. ACDE and FHIJ in the right-hand part of thefigure are the intradosal and extradosal developments of thearch, both symmetrical with respect to the axis OOj. The de-velopment of the intradosal helix is AMD, and that…
Stereotomy
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