Anthony, Gardner Chace, 1856- [from old catalog], Ashley, George Francis, [from old catalog] joint author · Boston, D. C. Heath & co. · leaf 110
me in contact with the cylinderat <?j, a at a^ and the hypotenuse ac will be-come a helix having a^c^ for the pitch, and theangle acd will be the pitch angle. If the right line ac be revolved about the cylinderwhile remaining in contact with, and tangentto, the helix,* and making the constant… … Fig. 166. * For the theory and construction of the helix andinvolute curves see page 104 of Elements of MechanicalDrawinsr of this series. 94 DESCRIPTIVE GEOMETRY 130. To draw elements of the surface of thehelical convolute. Construction. Fig. 167. Let the di-ameter, aH^^ and the pitch, aV, of the…
Geometry, Descriptive
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