estimate she could go, (a) "with all despatch," (b) "with despatch," (c) "with moderate despatch?" Ans. (a) 181-19 knots; (b) 17-171 knots; (c) 14-15 knots. 11. A twin-screw Atlantic liner in mid Atlantic breaks one propeller shaft, and it is stated that she finishes the voyage with one engine at threequarter speed. How do you account for a falling-off of only a quarter the speed, with a reduction of one-half the power? CHAPTER XXIII. 1. Discuss in general terms the difference between the conditions under which a naval architect has to design and build a war-ship and an architect to design and build a large building, or a civil engineer a bridge. 2. Discuss in general terms the conditions under which a war-ship designer has to work as compared with a naval architect designing large steamers of the Mercantile Marine. 3. State the advantages of having a forecastle in a war-vessel designed for high speed. 4. What advantages from a gunnery point of view are found in a warship of high freeboard, in addition to the advantages of comfort and seaworthiness? 5. Make a comparison between the dimensions and particulars of H.M.S. Drake and Duncan of nearly the same displacement, and indicate as far as you can the reasons for the differences in each case. 6. State the reasons which have caused large Atlantic liners to be considerably larger than the largest cruisers. INDEX Bilged compartment, sinkage due to, 178 approximation to, 204 BM, transverse, 184 —, approximation to, 184 Board margin, 167, 266 to sheathing, 122, 123 Bottom plating, 50 Chambers, water, to diminish rolling, 227 Change of trim, 204 Circle, area of, 159 Circles, turning, 237 Clutches to steering gear, 94 Coal bunkers, ventilation of, 109 Coal stowage as affecting stability, 197 Coefficient of fineness, 174 Collision bulkhead, 60 Corresponding speeds, 249 Corticine for decks, 48 County class of cruisers, protection of, 151 |