Steam engines, a thorough and practical presentation of modern steam engine practice (1920)
Ludy, Llewellyn V., 1875-, American Technical Society · Chicago, American technical society · leaf 106
blades on the water causes the water to bedriven backward. There is, however, areaction caused by projecting this mass ofwater sternward which results in the aheadmotion of the boat. The useful work done by the propeller is thework which forces the water directly sternward; of course, themovement… … Fig. 68. Typical Shape ofPropeller Blade 92 STEAM ENGINES the screw per minute is the product of the pitch and the number ofrevolutions per minute. Example. Suppose a screw is of 18-foot pitch and makes 72 revolutionsper minute. What is the speed of the screw in feet per minute and knots perhour?…
Steam-engines
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![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-232-141.webp)
