There was a problem when proofreading this page.
The Fourth FIGURE.
The Optical Delineation of a double Square.
 | An image should appear at this position in the text. To use the entire page scan as a placeholder, edit this page and replace "{{missing image}}" with "{{raw image|Rulesexamplesofp00pozz.djvu/39}}". Otherwise, if you are able to provide the image then please do so. For guidance, see Wikisource:Image guidelines and Help:Adding images. |  |
ERE you'll find the Advantage of your folded Paper; for, applying it to the Line of the Plan, you readily mark the Points 1, 2, 3,4, 5, 6, of the visual Lines, which must be drawn to the point of sight O. Then folding the Paper croſs-wiſe, as in P, you mark the Points 7, 8, 9, 10 placing the Points 7 on that of 6 unless you would would have the Square remov'd within the, Line of the Plan. Then from 8, 9, 10, drawing Lines to the Point of Distance E; where they interſect the Line 6, 7, draw parallels to the Line of the Plan; and your Work is done.
Within the Square B, you may eaſily inſcribe another Square by help of the Diagonals; as may be seen in the Figure.
