Sullivan, Christine [Gordon]. [from old catalog] · New York, Cincinnati [etc.] American book company · leaf 74
ish of Cambridge, in 1820. In perspective drawings objects diminish in size as they appearmore distant, according to optical laws, and it is impossible tomeasure their sizes. In orthographic projection two drawings arerequired, and the lengths of the lines are altered according to theangle at which… … plane that its projection on the vertical plane will be a hexagon BCDHFE (Fig. no). The three visible faces of the cube are equal in the representation. The angles are not right angles, as in the actual cube, but are acute and oblique, — two acute angles 60°, and two oblique angles 120°.The line BC…
Mechanical drawing
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