Higbee, F. G · New York, John Wiley & Sons · leaf 97
rcle in H and since this is a closed curvethe resulting surface is called acyHnder. It will be noted thatthe elements of a cylinder areparallel to each other. A conicalsurface is a surface generated bya straight line so moving thatone point remains stationarywhile the line constantly movesalong a… … Fig. 67.
Geometry, Descriptive
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