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 61
fg and g f show the position of the string when the pencil arrives at g. This method, when performed correctly, is perfectly accurate;but the string is liable to stretch, and is, therefore, not so good touse as the trammel. In making an ellipse by a string or twine,that kind should be used which… … Fis. SI 116.— The axes being given,, to describe an ellipsis with atrammel. Let a b and c c?, [Fig. 81,) be the given axes. Placethe trammel so that a line passing through the centre of thegrooves, would coincide with the axes ; make the distance fromthe pencil, e, to the nut,/, equal to half c d ;…
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-87-64.webp)
