The carpenter's and joiner's hand-book : containing a complete treatise on framing hip and valley roofs ... (1888)
Holly, H. W. (Henry Wells) · New York : John Wiley & Sons · leaf 33
Fig. 17. Lay a square upon the circle (Fig. 17),with the corner just touching the outer edgeof the circle. Draw the line a i across thecircle where the outside edges of the squaretouch it. Then half the length of the line a1) will be the centre required. No matterwhat is the position of the square,… … Fig. 18. Let a h c (Fig 18) be the given points. i Upon each of these points sweep the parts | of circles, cutting each otlier, as shown in the \ figure; draw the straight lines d d^ and where *they intersect each other will be the centre required. This method may be employed ^ to find the centre…
Carpentry
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