Higbee, F. G · New York, John Wiley & Sons · leaf 178
helicoid. In the given figure the square iXYZ, of which theline Oi is one side, has been revolved, thus cutting in the cyl-inder a square thread, whose faces are right helicoids.Fig. 134 shows a right helicoidal surface in the form usually 168 ESSENTIALS OF DESCRIPTIVE GEOMETRY used for conveyors.…
Geometry, Descriptive
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
