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July, 1910 very simple, the working parts consist- ing only of guide rollers or pulleys, which cannot get out of order. One man can fill the bucket and work the hoist from the stokehold floor level. The illustration is almost self-explana- tory. There are three cast steel brass- brushed guide wheels on each side of the bucket, and two wire rope guides, which pass between the wheels, as shown, the top end of each guide being attached to a thin cast steel plate or header. When the bucket is lifted, the middle wheel runs into the slot shown, while the top wheels run round the periphery of the header, and cause the 'TAE Marine REvVIEw bucket to tilt. The levers and weights are provided in case the vessel has a heavy list, in which case, the levers give the bucket a push back again to the vertical position. It also has the advantage of bringing the bucket quietly to rest. The only fitting necessary, be- yond fastening the wire ropes at the bottom end and as attachment for the pulleys, is a couple of angle bars on each side of the shoot on which the headers can be fastened, as shown in the dia- gram. This arrangement of self-tipping bucket can be supplied separately for working in conjunction with other types of hoist if desired. Duluth, Missabe and Northern Railway's Coal Dock HE United States Steel Corporation is steadily developing its physical equipment for the economical handling of its raw material and products of man- ufacture. Being blessed with abundant resources it does not falter at the ex- penditures of large sums to achieve any desired end. The new coal dock of the ~ boat McGonagle, full lengt the dock, hydrants being placed at intetVals and hose reels being kept in convenient places ready for im- mediate service. In addition the fire stationed at the ore docks adjacent, is available. The dock is built upon a reclaimed area and extends from the shore line to 291 pockets; a railroad car haulage system and belt conveyors for handling screen- ings from the pockets. All of this equip- ment is electrically operated by General Electric motors. The three counterbalanced steel towers travel along the end of the dock on a steel trestle 450 ft. long and 35 ft. high above the level of the dock. They are equipped with a two-ton capacity Raw- son grab bucket operated on a 53-ft. boom swung out over the water from the tower. The boom is pivoted on a universal joint at the point of 'its sup- port at the inner end, permitting it to be swung through a horizontal angle of 180 degrees. This arrangement enables. the boom to clear the mast of vessels at the end of the dock. The towers hoist the coal about 80 ft. from the ves- sel and as they are self-propelling they can accommodate their position readily to the different hatches of the vessel. The bucket delivers to a hopper in the tower and from this hopper four-ton cars of the cable railway system are supplied automatically. ~The cable railway system has a loop on the trestle at the end of. the dock. The ends of this loop are connected on the, shore side of the trestle with two i : Tur DuLutH, Missase & NortHern Rartway's Coat Dock at DULUTH. _ Duluth, Missabe & Northern Railway, Duluth, is a case in point. This dock was built to care for the fuel requirements of the Duluth, Missabe & Northern Railway and of the numer- ous iron ore mines contributory to the railways. The dock is 2,000 ft. long and 604 ft. wide, situated on St. Louis Bay contiguous to the ore docks. It is one of the thost complete structures of its kind in existence. Its fire fighting equipment is especially complete. Much thought has been given to this feature as the dock is somewhat isolated. A fireproof pump house is placed about midway on the outer end of the dock containing an 8-in..Aldrich triplet pump geared to a 75-H. P. motor. The pump draws water from the bay and. dis- charges from a 6-in. main extending the within 150 ft. of the 300-ft. channel maintained by the Federal government. This channel provides 26 ft. of water -and the intervening space between it and the: outer end of the dock has_ been dredged to a;similar depth, thus secur- ing a waterway 450 ft. wide. The equip- -ment is so arranged that coal is un- loaded from vessels moored at the end of the dock. The coal handling machin- ery, designed and erected by the Mead- Morrison. Mfg. Co., of Cambridge, Mass., consists -of the following units: Three one-man steel counterbalanced hoisting towers traveling qlong the end of the dock; a cable railway system which de- livers coal from these towers to storage or to elevated pockets; a double pick-up steel bridge that reclaims coal from stor- age to the 'cable railway system and tracks on a second trestle extending the full length of the dock along its. center line. At the shore end of this long trestle the tracks also are connected by a loop, thus forming a continuous circuit over which the four-ton cars are operat- ed. The pick-up bridge covers the stor- age space of one side of the trestle on the center line of the dock. The track on the adjacent side of that trestle is arranged so that cars may be diverted 'from it and sent around a loop which extends to the outer end of the bridge -and back to the trestle again. The hopper in each of the hoisting towers to which the respective grab bucket delivers coal is equipped with a car loader, by means of which the cars are filled without stopping, obviating the necéssity of an attendant at that point.