Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 84
view. Then 62 IX, § 86] INTERSECTIONS — DEVELOPMENTS 63 the plane is perpendicular to either H or V. In the followingexamples, the axis of each surface is perpendicular to H, sothat the auxiliary circles (§ 84) all lie in planes which areparallel to H. Note, in each example the visibility of…
Geometry, Descriptive
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