Ames, William L. (William Lewis), 1855-, Wischmeyer, Carl · New York, McGraw-Hill book company, inc.; [etc., etc.] · leaf 13
e of the planes is taken vertical and called the verticalplane of projection or V; the other is taken horizontal andcalled the horizontal plane of projection or H. The twoplanes intersect in a line called the ground line and desig-nated by X. The intersection of the two planes formsfour dihedral… … Fig. 2. REPRESENTATION OF POINTS 3 For the convenience of the draftsman the planes areconsidered as rotated about X, so that the first and thirdquadrants open to 180° and the second and fourth quad-rants close to 0°. II. Representation of Points. In considering the representation of a point as…
Geometry, Descriptive
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