"Verbal" notes and sketches for marine engineers : a manual of marine engineering practice, intended for the use of naval and mercantile engineer officers of all grades, and students, and is specially compiled for the use of engineer officers preparing for examinations of competency at home or abroad . I 4I ! Appendix 649 Increase of Steam Volume.—To allow of the increasingin vol 11 me, as fall of pressure takes place, the various sets of bladesincrease in length from the forward to the after end, the clearancespaces between the blades also increasing in proportion, whichnecessitates p
"Verbal" notes and sketches for marine engineers : a manual of marine engineering practice, intended for the use of naval and mercantile engineer officers of all grades, and students, and is specially compiled for the use of engineer officers preparing for examinations of competency at home or abroad . I 4I ! Appendix 649 Increase of Steam Volume.—To allow of the increasingin vol 11 me, as fall of pressure takes place, the various sets of bladesincrease in length from the forward to the after end, the clearancespaces between the blades also increasing in proportion, whichnecessitates packing pieces of a larger size being employed. Theblades also vary in shape or curvature, being flatter in section aft OPPER WIRE. BRASS WIRE PACKINGPIECES COPPER WIRE PLAN No. 6. — Elevation and Plan of Rotor Blades in Position,showing how secured (full size). than forward Each set of blades for each expansion requires itsown allowance for expansion of metals b) heat, so that the workingclearance between the blades and casings or drums increases slightlythroughout the turbine from forward aft. One of the practical diffi-culties met with in turbine construction at present is the correctadjustment for this expansion, as slight mishaps have occurred in 650 Verbal Notes and Sketches one or two instances owing to fouling of the parts when heated up,the clearance allowance being insufficient. Strictly, each successive ring of blades should be either of a widerpitch or greater height than the preceding one, as the steam is con-tinuously falling in pressure and expanding in volume. Dummies.—The dummies are placed at the steam admission end ofeach turbine, and two kinds of dummies, known respectively as radialand fac
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Keywords: ., bookcentury1900, bookdecade1910, bookidverbalnotess, bookyear1917
