Descriptive geometry . 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 which denotesthe actual point, line, or object projected. Projections on thevertical coordinate plane, V, will be similarly denoted by the.

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