The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 138
feet very nearly ;consequently, the successive portions of the circumference, estimatedfrom the impost to each of the beds or coursing joints as far as thecrown or middle of the keystone, are respectively as in the followingtablet. Courses. 0 / / Courses. 0 / 1st 5 17 38if 0th 47 38 49/, 2nd 10 35… … The 17th course, or course at the crown of the arch, correspondingan angle of 90 degrees as it ought tu do, when the keystone is in two parts, as we have assumed it to be in the present instance, for theexpress purpose of showing the influence of the obliquity upon thebevels in that course. From…
Architecture · Civil engineering · Science
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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-376-259.webp)
