Industrial drawing and geometry; an introduction to various branches of technical drawing (1911)
Spooner, Henry John, 1856- · London, New York [etc.] Longmans, Green, and co. · leaf 33
Pig. 42.—Construction of angles. Pig. 43.—Setting out an angle with the protractor. 90°, and the angle between the arms of the straight ILae ACB wUl be 180°. Obviously, if we bisect the angle BCD in E, we get CE inclined 45°to CB. Other angles can be constructed with equal facility. Thus, if we…
Mechanical drawing · Geometrical drawing
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