the steam ports equals ^ - th , and that of the exhaust - jJgTh ° f the area of the cylinder : thus — 2042 = 81 * 6 - i - 2 : = 40 ' 8 square inches in steam port ; 2 5 2042 = 157 - i - 2 — 79 square inches in exhaust port . TT A little more or less may be allowed to secure even dimensions . Throw… … Fig . 250 . — Path of Crank . oscillation as at B , the vertical distance to any point that may be determined on for cutting off the steam , say at five - eighths of the stroke of the piston , as from IN to OUT , is the
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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-242-152.webp)
