Descriptive geometry for students in engineering science and architecture; a carefully graded course of instruction (1915)
Armstrong, Henry F. (Henry Fry), 1868- · New York, J. Wiley & sons, inc.; [etc., etc.] · leaf 87
The two generators parallelto the plane of the hyperbola in this case are shown at a and b, and their HorizontalTraces are at ////. The curve of the hyperbola is shown in plan at cc with its trueform by rabattement at C2C2. The H.T.s of this curve are at gg. Now, if the line cc which lies on the… … Fig. 81. a small distance from the plane of the hyperbola, the tangents to the hyperbolalines, at infinity, and the generator hnes near them are pairs of parallels. Thesetangents and generators on the surface of the cone at infinity will meet the cir-cumference of the circular section of the cone…
Geometry, Descriptive
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