Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 206
ivided proportionally at 1, 3, 5 VIII, § 165] CURVED SURFACES 189 and at 2, 4, 6. The lines 1-2, 3-4, etc., are elements of anhyperbolic paraboloid, as pointed out in the previous paragraph.By drawing the lines Ie, 2/, etc., corresponding to 1 e, 2/,etc., in Fig. 177 a, it can be shown that the… … Circular stairs.(Helicoid ) Arch in a cylindrical wall.(Conoid)
Geometry, Descriptive
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