An Elementary Treatise On Orthogiaphic Projection: Being a New Method of ...
An Elementary Treatise On Orthogiaphic Projection: Being a New Method of ...
William Binns
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3 is supposed to stand ; draw a' b', A b : then will No. 4 be a plan of a prism resting upon a plane which makes an angle of 30° with the horizontal plane : therefore the least angle which the axis of the prism makes with the horizontal plane will be 60°, and the greatest angle 120°, as shown by the dotted line in No. 3. Art. 108. — It is now required to find the projection of No. 3 in the upper plane, or the appearance that figure would present if it were turned in the direction of the arrow, ...together with the plane on which it stands, so as to make one-eighth of a revolution. The direction of motion in this case is left-handed (Art. 74). Again, the arrow is drawn parallel to the intersecting line and at right angles to the vertical pro- jecting rays, to indicate that the figure is supposed to turn upon an axis, such as that represented by the pro- jecting ray from point 2; in which case every point in the G Digitized by VjOOQIC 82 OBTHOGRAPHIC PROJECTION figure would move in a plane at right angles to the ver- tical plane and parallel to the horizontal plane.
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