Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 28
ertical, theshort edges parallel to H. Theprojection of the card on F~is theequal rectangle avbvcvdv, and on //the straight line a*6*c*d*, equal inlength to the short edge. Theperpendiculars dd and ddh deter-mine a plane which is perpendicu-lar to both IIand V, and thereforebo their line <>(… … Fig. 11. 8 DESCRIPTIVE GEOMETRY [I, § 11 perpendicular to GL. This is one of the fundamental relationsof orthographic projection. 12. Notation. In this book, projections on the horizontalcoordinate plane, H, will be denoted by the small letter, h,attached as an exponent to the letter or character…
Geometry, Descriptive
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