Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 201
e of w, x, y, zare in the plane of the upper base, HA. The elements ofboth nappes can now be drawn on the V projection, as as. 182 DESCRIPTIVE GEOMETRY IVIII, § 159 If accurately determined, the V projections of the elementsshould all be tangent to the given V projection of the helicaldirectrix. Or… … R (MXd w r (e) fd) Fig. 174 to a developable helicoid. The Unes ah, be, etc., are equal,and the angles abc, bed, etc., are equal. But the lines aj, jk,etc., are not equal, nor are the angles ajk,-jkl, etc. If the surfaceis developed, the line a-i becomes a broken line, the componentparts of which…
Geometry, Descriptive
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
