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328 PASSAGEWAY CONNECTING FORWARD AND AFTER ENDS OF MAIN SALOON THE MARINE REVIEW BOAT DECK TAKEN FROM TOP OF shoes for both ahead and backing slides, _while the crosshead pins are of machine steel taper fitted to the crossheads and are' 6 inches in diameter by 8%4 inches long. The connecting rods are of open- hearth steel 7 feet 3 inches long center to center, with brass top end_ boxes, adjustable for wear with a taper wedge. The crank pin boxes are of cast steel lined with babbitt and secured to the tee-ended connecting rod with annealed steel bolts, 234 inches diameter and a 3-inch thread. The connecting rod body is 434 inches in diameter at the top and 534 inches at the bottom. The crank shaft is of open-hearth steel of the built-up type with cast steel slabs securely shrunk and pinned to the shaft. The diameter of the crank shaft and crank pins is 12!4 inches and the length of the crank pins 12:4 inches. The shaft is supported in six journals, two of which are 1914 inches long and foun, <15- inches lone, all lined with babbitt and having semi-steel caps. se- cured with steel binder bolts, 314 inches PILOT HOUSE September, 1914. in diameter. The thrust bearing is of cast iron with cast iron shoes faced with babbitt and fitted for water circulation; the STATEROOM SHOWING TO SIDE OF SHIP WITH ATR PORT PASSAGEWAY VIEW OF AFTER DINING ROOM thrust pressure being taken up on four collars with a unit pressure per square inch of about 60 pounds. The thrust shaft is' of open-hearth steel 12 inches diameter with coupling and thrust collars forged on. The line shaft is also of open-hearth steel 12 inches diameter, supported in babbitt- lined, steady bearings placed at inter- vals not exceeding 18 feet. The tail shaft is 1214 inches in diameter in the body. and 1314 inches in the stern bear- ing, which is 5 feet 7 inches long. The propeller is of the sectional four- bladed type 12 feet 9 inches diameter, with a uniform pitch of 14 feet 9 inches and a developed total blade surface of 62 square feet. The hub and blades are of special mixture of tough cast iron with machine steel studs and brass nuts. The bedplate and both front and guide columns of the engine are of cast iron box sections, all properly and_ se- curely bolted at their various points of connection. Reversing of the engine is accomplished with a direct-acting steam cylinder 10-inch bore and_ 15-inca a i ahs ea a i ea