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102 THE MARINE REVIEW : me ae BRK eK ee i - yi -_<-]|---=-- - --hS s re ' ee ee eee ot a Peas eae 2ur+ PLAN a7 seer eld FLOOR x " PLAN a O Ee --|o CONCRETE WALL EVERY 874 Bay 10 5sa' of i] xo" PLS) 48-35 3 8 uw '2-10'x -- TIVM BLAYONOD ONCRETE IRDER TGs - PLAN OF SUPPORTS "oe crt = 1 ! PLAN Pr 4 Z yA 4 "a COUN TERWEIGHT N AN FOUNDATION SoD. DDR 47 WIRE ea CVE SECTION OLD ;ROP TY Pao CROSS a wo £O =e OLD 4 >. 4 * ft Ya STEEL Pi \ FRONT ELEVATION LOW W.L. March, 1933 automatic brake with the left hang and then he holds the lever. of the friction clutch in operating POsition with the right hand. The machinery is simple and all moving parts are wel protected by safety coverings. The chute itself tapers from 8 feet, 6 inches at the upper end to 4 feet, 6 inches at the lower end with a curved bottom throughout the whole length, Many ore chutes have been built with flat bottoms, straight sides or with bends in the sides which caused the ore to stick or to spill over. This chute was designed on the theory that soft iron ore flowing with some veloc- ity would act much the same as g stream of water. The behavior of the chute in service seems to confirm this view. When both bin or pocket doors are open the ore flows in the chute about a foot in depth apparently fast- er in the center and with increasing velocity towards the ends of the chute and the ore does not stick or spill over, The practical effect of this easy flow through the chute is to enable the oper- ator to run. ore to the far. side on vessels 60 feet or more in width and to trim the boat perfectly. Owing to the absence of sharp angles in the pockets and the location and width of. the doors, there is little poking to be done and few men are employed for this purpose on the new dock. Loading Achievements Since the completion of the dock no efforts have been made to obtain loading records, though some very good time has been made. On Aug. 2/, the steamer Price McKinney loaded 7,733 tons of soft ore in three hours or at the rate of 2,578 tons per hour. On Oct. 24 the steamer Michigan loaded 9,692 tons of soft ore in 4% hours, or at the rate of 2,280 tons per hour. A' portion of a cargo, 5,600 tons of soft ore, has been run_ into a boat in 114 hours, or at the rate of 4,480 tons per hour. On Oct. 29, 3,344 tons of hard ore were run into the steamer W. G. Mather in 23 minutes, only three men being actually employed in this operation. This was at the rate of 10,000 tons an hour. The design of the superstructure eae a ot oo 'NT STEEL AND CONCRETE DETAILS OF ONE REGULAR AND ONE BRACED LONGITUDINAL PANEL OF ORE BIN AND DOCK was made by B. F. Jackson, vice-pres- ident of the Wisconsin Bridge & Iron Co., and that of the substructure by 'R. C. Young, chief engineer of the Lake Superior & Ishpeming Railroad. J. C. Greiner was consulting engineer. The Wisconsin Bridge & Iron Co. fut- nished and erected the steel and ma chinery; the pile driving and concrete work was handled by the Raymond Concrete Pile Co, and the Zenith Dredge Co. did the dredging. The NANINGNING NCL NINES Zh a . as - min |e SECTION LINE . VPNIN ENING PVININIVININTN TG s CENTER '. ON DNV GN ING Ne NID AN EVEL Navy MY = LONGITUDINAL