Gore, James Howard, 1856-1939 · New York, Longmans, Green, and co. · leaf 179
straight line, so moving as to intersect a given curve and alwaysbe parallel to a given straight linenot in the curve. Thus if the line EF moves soas to continually intersect thecurve DC, and always be parallelto GH, the surface AC is a cylin-drical surface. 406. The moving line EF is the…
Geometry
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