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26 THE MarRINE REVIEW TREVIRANUS RAPID ORE CAR * of getting the ore out of the cars into UNLOADER. Methods and machinery for the more rapid mining. of inon ore have been the docks by means of hand labor have remained. In short, the entire opera- tion:of shipping ore is completely de- " FIG. 1--END ELEVATION -OF ORE CAR UNLOADER, / . continually developed during the past 20 years. Railroad transportation has been much improved, and locomotives, - ears, and docks have been increased in number, strength, and capacity, but up to this time the first primitive methods pendent upon what is the most trouble- some feature in the working of the dock, namely, labor. -To supplant this system, the details of which are too well known to need description, Geo. Treviranus, the dock 244115" superintendent of the Duluth, Missabe & Northern road, has devised what he styles a "rapid ore car unloader." The apparatus, shown in the accompanying drawings, consists of an overhead trav- _ eling bridge similar in idea to the car- riage of a gantry crane. This will span the ore pocket from the "gallows frame" to the center of the dock and the runway will extend the length of . the dock so that the entire unloading space is accessible. The trucks of the ' bridge will run on Z-bar rails, laid on the outside of the dock, along the. gallows , frame and on_ the inside along a _ built-up runway. so that the only alterations to the present docks necessary for the installation of this machine would be a possible stif- fening of the gallows frame and the building of the central runway. 'Mounted on this traveling bridge, and operated by means of pinions run- ning on two fixed vertical racks sup- ported by a structural steel framework, are' a set of blades. which may be raised and lowered, being used as a ram, or by the movement of the bridge along the dock may be used as a sweep. The blades are driven by the -connecting mechanism from a motor, and a downward pressure up to eight tons may be exerted by them to break through the ore in the cars as they force it out through the hopper bot- toms. The bridge is high enough above the tracks, on which the loaded cars are | 18" From re. FIG, 2,--SIDE ELEVATION OF ORE CAR UNLOADER,