The Marine Steam Engine, Its Construction, Action and Management; A Manual and Book of Reference for All Interested in Steam Navigation. with an Atlas of Lithographic Plates (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1902 Excerpt: ...thrust and Iff. If these rise suddenly at higher speeds, it is evidence that the resistance is disproportionately increased and that the form of the ship is unsuitable for speeds so great. 4. For similar ships the horse-power can be determined from the curves of their predecessors (see 19). 5. The curves of slip under certain circumstances assist the detection of an unsuitable propeller (see 15). BUSLEY, The Marine Steam Engine I. 2 A Seventh Division. Selection of the most Suitable Type of Engine. 41. Classification of the Types of Engines. ) Marine engines may be classified a) According to the kind of propeller they actuate, b) According to the pressure of and manner of using their steam, c) According to the number, position, and attachment of their cylinders, d) According to the method of transmitting the force from the piston to the crank. Class a) conditions the position of the machinery, class b) the system, and c) and d) the type of it. ) a. According to the kind of propeller marine engines are divided into screw, paddle, and reaction or "hydraulic" engines. ) b. Classified according to pressure and manner of using the steam we may distinguish Low-pressure engines when the working pressure is below 2 atmos., Medium pressure engines between 2 and 4 atmos., High pressure engines,, above4 atmos.. Non-condensing engines, when the exhaust steam escapes to the atmosphere, Condensing engines is condensed, Single-expansion engines when the steam expands in one cylinder, Double-expansion or compound engines, when the steam expands by successive stages in two cylinders, Triple-expansion engines when the steam expands by successive stages in three ...