This is an alternative method of drawing perspective which has the advantage that no plan has to be drawn. If the sizes are known, they can be used directly on the horizontal and vertical scales and a perspective drawing produced. Once the SP has been used to fix the measuring points (335:A) it can be ignored.
Remember that the measuring points fix measurements of length and width, read off directly from the height scale, the lines from which are taken to the vanishing points.
As the object of such a perspective drawing is to convey the visual appearance only, and not to
serve as an accurate scaled representation from which critical measurements can be taken, small details should be drawn free-hand rather than rigidly adhering to mechanical projection with its inevitable distortion. Curves are also better drawn as free-hand ellipses after plotting the general position.
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