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44 Mm oR el UN t CAR FERRY DETROIT In the Marine Review of Oct. 27 was given a_ brief description of the car ferry Detroit launched from the yards of the Great Lakes Engineering Works on Nov. 12, 1904. The Review is now enabled to give a more extended description of a very interesting vessel, especially with reference to her _machinery, which is naturally the vital point in a boat de- signed as this is for heaviest winter work. The Detroit is 308 ft. long on deck; beam, molded 64 ft.; beam over guards 76 ft.; depth molded 1914 ft.; displacement loaded 3,850 tons. She is fitted with rudders at bow and stern and the general plan of propelling machinery includes four screws, two forward and two aft, driven by independent engines, and as the hull lines are practically identical at both ends she is prepared to work equally-well in either direction. A de- scription of one engine will serve for all, as they are identical. They are' of the Rosi OV od ee ae ----$----> maximum load on the guides not exceeding 50 lbs per square inch. The crosshead pins are 6 in. by 9 in. of tool steel, ground all over. The guides are hand scraped to a perfect bearing and are water jacketed. 'The piston rods are 5 in, diameter of hammered steel, ground all over and fitted as well as the valve rods with metallic packing. Steam revers- ing gear of usual direct type is fitted. The Review is assured by the builders that the like parts on these engines throughout are absolutely interchangeable and that in proof of it they were taken at random as they came to the erecting floor and without a hitch, all parts being made to standard gauges and templets. This is a new feature in marine engine construc- tion and would seem to be of value to the owner. The thrust shafts are 11 in. diameter with six collars. The thrust shoes are water jacketed. The line shafting is. 10% in. diameter. The tube shaft and tail shaft is 11%4 in. diam- eter, 1134 ih, 7 bearings and are usual vertical in- l z verted type, com- c i" eee | Ee l t coupled just aft of pound, with cyl- NZ inders 24 and 48 in. diameters, by 33 in. stroke, de--- fj signed to work, under a pressure of 150 lbs. steam. This pressure, however, will only be carried when battling with ice, a. FS tea Veg \ Ly Noire Bes Saya Ns eae | Pe | SCI eee et oh the boss bearing by a massive steel split sleeve coup- ling to permit of drawing the tube shaft inboard. The boss bearings are interch a n g eable with the bracket bearings. The tail shafts are taper =o the ordinary pres-- "7 F | oe Tee sure in open water I aie : ° op = He will be 100 Ibs. ee SECTION THROUGH ENGINE ROOM OF CAR FERRY DETROIT. The engines are exceedingly heavy and built to withstand the strains and shocks of the severest service. The crank shafts are of the finest open-hearth steel, . of the built-up type with all cranks counterbalanced. The shafts are 1034 in. diameter and the crank pins 10 in. diameter and 10 in. long, and crank pins and journals are ground. In this connection it may be said that the Great Lakes company claims the distinction of being the only concern in its line equipped for so finishing work. The crossheads are very heavy with unusual surfaces, the fitted to the pro- pellers which are solid, four-bladed, 10° ft. 6. in.' diam- : eter, 14 ft: -6..in: pitch and are of course extremely heavy. The brackets are of cast steel and are reinforced by a diagonal fore and aft member which is cast in one piece with the vertical strut. The lines of the hull made bossing out impracticable and brackets had to be resorted to. The auxiliary equipment includes two twin vertical air pumps (one in each engine room) of the "Great Lakes" type with jet condensers. The steam cylinders are compound 13 in. and 22 in. diameter and the pumps are 27 in. diameter, GENERAT, ARRANGEMENT OF HUI, MARINE REVIEW I OF CAR FERRY DETROIT,