Field-book for railroad engineers. Containing formulas for laying out curves, determining frog angles, levelling, calculating earth-work, etc., etc., together with tables of radii, ordinates deflections, long chords, magnetic variation, logarithms, logarithmic and natural sines, tangents, etc., etc (1877)
Henck, John Benjamin, 1816-1903 · New York : D. Appleton · leaf 24
the tangents may beassumed of a certain length, and the radius calculated. * Some engineers prefer a chain 50 feet in length, and measuie the length cf :ienrve by chords of 50 instead of 100 feet. The chord of 100 feet has been adopteiithroughout this article; but the formulae deduced may be very… … Solution. ])niw CO. Then in the right triangle AOC we lia«, iTab. X. 3) 4-;- = tan. AO C, or, since A 0 0=^1 a 2, VI.)A O - = tan. 2 /; T = R tan. ^ /. Example. Given 7 = 22== .52, and /? = 3000, to find T. Here A= 3000 3.477121 ^7=11° 26 tan. 9.305865 T= 606 72 2.7829»0 .5. Problem. Given the…
Railroad engineering · Ferrovias
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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-67-45.webp)
