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 65
ained by planesas they incline to one another, the illustration at (i), Fig. 60, shows two planesRST and LMN meeting each other in a vertical line at H, and meeting the H.P.at right angles with the result that the angle and its supplement, named the dihedralangles contained by these two planes, are… … Fig. 60. they are equalled by the rectilineal angles contained by the traces or intersectionsRS and LM on the V.P., that is, on the plane perpendicular to them. At (iii) the planes are so arranged that they are not perpendicular to oneof the planes of projection, and consequently a third plane,…
Geometry, Descriptive
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