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The Third FIGURE.
The Delineation of an Oblong Square in Perſpective
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ET the Breadth BC of the Square A, be plac'd in the Line of the Plan, by the Compaſs, or a folded Paper, and from the Points B and C, make the Viſuals to he Point of Sight O. Then fold your Paper croſs-wiſe, and mark CD the Length of the Square, drawing the Line DE to the Point of Diſtance, and the Line FG parallel to BC, which will complete the Optick Delineation of the oblong Square
The other Figure ſhews the Folding of the Paper croſs-wiſe, which is of ready uſe in delineating Squares, whoſe Breadth exceeds their Length, or vice verſá; or whoſe Length and Breadth are equal.
