The American house-carpenter; a treatise on the art of building, and the strength of materials (1867)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York, J. Wiley · leaf 35
81, a.—A second method. Upon any two points in the cir-cumference nearly opposite, as a and h, (Fig. 39,) describe arcscutting each other at c and d: take any other two ]^oints, as eand/, and describe arcs intersecting as at g and h ; join g and A,and c and d ; the intersection, o, is the centre.… … Fii^. 4a 81, b*-^A third method. Draw any chord, as a b, {Fig» 40,) PRACTICAL GEOMETRY. 2,*^ and from the point, a, draw a c, at right angles to a b ; join c and b ; bisect c 6 at d—which will be the centre of the circle. If a circle be not too large for the purpose, its centre may veryreadily be…
Carpentry · Architecture
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-332-223.webp)
