Geometrical drawing, projection drawing, freehand and ornamental drawing, wash work and brush drawing, elementary perspective drawing, architectural drawing (1921)
International Correspondence Schools · Scranton, PA : International Textbook Co. · leaf 80
On the otherhand, the nearer the point x is to the vertex a, the more acand a d will approximate to a straight line, and when points xand a coincide, the lines ac and ad will be straight lines. Case II.—Execute this same problem within a rectanglewhose base cd \6 b\ and whose height ce \s> 22.… … Pig. 1 Fig. 2 and dimensions of the object are projected on the paperin their actual proportions, thereby giving a diagram thatcan be scaled or measured so as to serve as a pattern. In all branches of design wherein working drawings arerequired, projection drawing forms the basis of the opera-tions…
![An illustration from One thousand processes in manufactures and experiments in chemistry / [Colin Mackenzie]. (1825)](https://img.insideoutlibrary.com/img/200/wellcome-wellcome_b29307867-165-1.webp)
