Scribner's engineers' and mechanics' companion : comprising United States' weights and measures : mensuration of superficies and solids ... the mechanical powers ... steam and the steam engine (1848)
Scribner, J. M · New York : Huntington and Savage · leaf 47
of two Concen-tric Circles. Rule-—1. Square the diameter of each circle, and subtract thesquare of the less from that of the greater. 2. Multiply the difference of the squares by the decimal 7854,and the product will be the area. Or, multiply the product of the sum and difference of the… … Note. The area of each of these circles is equal to the square of the diameteimultiplied by 7854. (Prob. 3.) And the difference of these squares is equal to theproduct of the sum and difference of the diameters. Therefore, the area of the ringis equal to the product of the sum and difference of the…
Mechanical engineering · Weights and measures
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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-346-237.webp)
