Descriptive geometry . 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 re-. 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

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