A history of the growth of the steam-engine (1878)
Thurston, Robert Henry, 1839-1903 · New York, D. Appleton · leaf 425
ll-power naval ves-sels, screws of three or four blades are used. The usual form of screw (Fig. 139) has blades of nearlyequal breadth from the hub t6 the periphery, or slightlywidening toward their extremities, as is seen in an exagger-ated degree in Fig. 140, representing the form adopted for 400… … Fig. 139.—Serew-Propeller. is globular and very large. The blades are secured to thebub by flanges, and are bolted on in such a manner thattheir position may be changed slightly if desired. Theblades are shaped like the section of a pear, the wider partbeing nearest the hub, and the blades tapering…
Steam-engines
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