Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 27
Fig. 17. Fig. 18. Fig. 19. Fig. 20. 47.—A circle is a figure bounded by a curved line, called thecircumference ; which is every where equi-distant from a cer-tain point within, called its centre. The circumference is also called the periphery^ and sometimesthe circle. 48.—The radius of a circle is… … Fig. 21. 49.—The diameter is a right line passing through the centre,and terminating at two opposite points in the circumference.Hence it is twice the length of the radius, (c d, Fig. 21.) 50.—An arc of a circle is a part of the circumference, (c 6, orhed, Fig. 21.) 51.—A chord is a right line…
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-162-91.webp)
