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March, 1912 THE MARINE REVIEW View Lookinc WESTWARD hammer falling 3 [6 in, for the last foot of progress. A few other piles required almost as heavy ham- mering, but they did not suffer any appreciable damage except at the fop in the part which is buried in the concrete superstructure. No' particular difficulty was en- countered in the construction of the concrete superstructure. Traveling mix- ing plants were employed mounted on flat cars and scows. In both cases they were equipped with hoist tow- ers from the top of which chutes wete suspended to convey the con- crete into the wall forms. About: 3,500 "ca. (yds. vot "concrete "was placed in the dock struts and un- loader walls. The bridge supported on piles also, but the super- structure was placed after the filling had been made. The mixer for this work was also placed on a railroad car and supplied with material from other cars on the same track, laborers handling the material in wheelbar- rows. The concrete was hoisted in a bucket and deposited in the walls through a chute, 5,900 cu. yds. of gravel concrete in the proportion 1:3:6 being placed. The Great Lakes Dredge & Dock Co. also constructed the foundations for the power house and the substructure for the Hickory street crossing. The ore trough was constructed by the Dravo Contracting Co., of Pitts- burgh. The work undertaken by the Penn- sylvania system also includes a com- plete trackage development on. the made land, the construction of a dou- ble track subway under the sevev tracks of the I.ake Shore railway at Wickory street, and a system of elec- tric locomotives for handling the cars under the unloading machines. walls are DvRING CONSTRUCTION Contract for the ore handling equip- ment was awarded to the Wellman- Seaver-Morgan Co. of Cleveland. The machinery equipment consists of four 17-ton Hulett unloaders and a 15-ton ore stocking and rehandling bridge. It is represented that when finished it will be the most complete ore-handling plant so far constructed on the lakes. It is expected: to be ready fcr operation at the opening of navigation this season. The unloaders are arranged. along the face of the dock and are used for unleading the ore from boats lying - alongside the dock, and loading into cars for direct shipment, or trans- ferring the ore to a pit at the rear end of this machine, where it is with- in easy reach of the bridge, to be rehandled and placed into storage piles. From these storage piles it may then be rehandled by the bridge and loaded into cars for transport to furnace plants. The ore, whether 99 loaded into cars directly from the boat or by means of the bridge, after having been in storage, is handled through scale hoppers which accu- rately weigh the ore, as it goes into the cars, so that a complete record of the ore handled by these machines, either by the unloaders or the bridge is made without the use of track scales. The Hulett unloaders are massive machines in every way. They consists of a heavy framework mount- ed on wheels, which travel along the runway rails next to the face of the dock. The runways of these ma- chines are spaced about 71 ft. cen- ters, the main framework spanning tracks located beneath the machine. The rear end of the main framework is extended beyond the back run- way a distance of about 57 ft.,. this back cantilever overhanging an ore pit into which the ore is discharged. to be Jater rehandled by the bridge and placed in storage. The upper part of the main frame is provided with rails upon which a trolley trav- els. This trolley carries a walking beam from the outer end of which is suspended a vertical stiff leg with the bucket at its lower end. This bucket leg is mounted on a pivot 'which is carried on the trolley. The forward end of the walking beam with the bucket leg attached is heavier than the rear portion of the walking beam, so that the bucket wili descend by gravity. The motion of the walking beam is controlled by means of ropes attaclied to the rear end of the trolley, and the walking beam operated by an electric motor at the back end of the walking beam. The length of this leg and walking beam is stich that the ore can he . reachedl in any part of the boats; which are engaged in the ore handling trafic, : - GENERAL VIEW LooKING WEST ON Pirre Drivinc