Anthony, Gardner Chace, 1856- [from old catalog], Ashley, George Francis, [from old catalog] joint author · Boston, D. C. Heath & co. · leaf 111
quired helical convolute be given. Then will(fi^^v^v^v \^Q ^\^Q vertical projection of the helix,and the tangents to the space helix will be theelements of the convolute. From any point … h draw a tangent to the helix. Its horizontalprojection, h^k^^ will be tangent to the circleof the base at 5^ and the length of this pro-jection will equal the arc h^e^i^; therefore, k^ DEVELOPMENT OF HELICAL CONVOLUTE 95 will be the horizontal projection of the hori-zontal trace of the element hk^…
Geometry, Descriptive
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