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 22
Fig. 19 Fig. 20 Fig. 19 has two angles of 45° each, and that in Fig. 20 oneof 60° and one of 30°. They are called 4^° and 60 triangles, 8 GEOMETRICAL DRAWING §1 respectively. To draw a vertical line, place the T square inposition to draw a horizontal line, and lay the triangleagainst it, so as to…
