The carpenter's and joiner's hand-book: containing a complete treatise on framing hip and valley roofs. Together with much valuable instruction for all mechanics and amateurs, useful rules, tables, etc. ... Illustrated by thirty-seven engravings (1863)
Holly, H. W. (Henry Wells) · Norwich, Conn., Published by H. W. Holly · leaf 33
Lay a square upon the circle (Fig. 17),with the corner just touching the outer edgeof the circle. Draw the line a h across thecircle where the outside edges of the squaretouch it. Then half the length of the line ao will be the centre required. ~No matterwhat is the position of the square, if the… … Fig. 18. Let a h c (Fig 18) be the given points.Upon each, of these points sweep the partsof circles, cutting each other, as shown in thefigure; draw the straight lines d d, and wherethey intersect each other will be the centrerequired. This method may be employedto find the centre of a circle…
Carpentry
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