Architectural drawing : a textbook that combines the parctical instructions and examples that the student needs, with the suggestive programs, supplementary problems, etc, required by the teacher, written by an architect of wide experience who has also taught the subject for years at Teachers' College, Columbia University, and Mechanics' Institute, New York (1920)
Teale, Oscar S · New York : U.P.C. Book · leaf 20
^ FIG. 7. The 3O°-6O°-90° set-square is used as a guide indrawing lines, at either of the three angles, to anygiven line in same manner as is done with the 45°angle. … These two instruments are also called Right AngleTriangles, (The 90° angle of each being the rightangle.) 18 ARCHITECTURAL DRAWING By sliding the set-square along the blade ofT-square, a great many lines at an angle of 45° maybe made in the length of the T-square blade, and thelines may be drawn to…
Architectural drawing
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