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100 THE MARINE REVIEW GENERAL VIEW LookiInNGc Eastwarp DuriING CONSTRUCTION The bucket at the bottom of the leg has a capacity of 17 tons of ore and is directly controlled by an op- erator who travels with the bucket in a small cab located in the bottom of the leg, directly over the bucket. 'This bucket leg is walking beam on a_ swivel. bearing, which enables the leg to rotate in a' complete circle. From his position in the bucket leg, the operator controls the motions of raising and lowering | the bucket, rotating the bucket leg, epeninge and closing the brcket and traversing the trolley in and out. After the bucket fills itself in the hold of the boat it is raised 'out of the hatch and the trolley is traversed back until the bucket is in position to discharge its contents into an ore hopper, which is. supported in the main framework of the machine. This hopper has a capacity of 70 tons of ore and is provided with discharge gates at the bottom. These gates are of the disk type and are operated by means of an electric motor and discharge the ore into a scale larry which travels on tracks suspended from the under side of the main framework. This larry is controlled by an independent operator who trav- els with the larry. The larry bin has a capacity of 50 tons of ore. This bin is carried on scales which have a recording beam in the operator's cab. After loading the scale larry from the 70-ton bin. the larry operator, after weighing the ore, moves the larry over a car track upon which the cars are standing and into which he desires to discharge the ore. Having ful! control of the scale beam. the operator is enabled to discharge into the car any prede- termined amount of ore up to the ca- pacity of the larry, the larry being suspended from the' provided with gates at the bottom of the bin which are arranged to cut off the flow of the ore, after any desired amount has been discharged. If: the ore taken from -the boat' is not going into cars for direct ship- ment, the Jarry is main hopper and discharged into storage pit at the back end of the machine, where it may be rehandled by the bridge. These unloaders are electrically -operated throughout, the current for the operation being taken from the conductor rails located along the runway of the machines. The current from these rails is taken off by means of sliding shoes, which are carried on the machine. The machine is traveled along the runway by means of a motor which' is geared to the trucks. This motor is mounted on a platform in the main framework of the machine and is also filled from the - March, 1912 . used for driving the ore gates in the 70-ton hopper, into which the bucket discharges. This motor is of mill type and bas a rating of 150 h. p. The scale larry is mounted on an incline track suspended from . the framework and is traversed along this track by means of a motor which opergtes a drum upon which are wound haulage ropes, the other ends of which are attached to the rear end o1 the machine. This motor is mounted on the framework of the larry and, has a rating ot 150) he pi The larry gates are operated by a separate motor, also suspended in the larry framework. This motor has a rating of 35 h. p. and operates the undercut gates on the larry bin through a worm.gearing reduction. The trolley carrying the walking beam is traversed back and forth on ton of the machine by means of a rack and pinion. The racks are at- tacked to the main girders of the michine and the pinions are carried on the trolley. The pinions are driven by means of a 100-h. p. mo- tor mounted in the framework of the trolley. This motor is_ controlled by the operator in the bucket leg. The walking beam carrying the buck- et is operated by means of ropes attached to the rear end of the walk- ing beam which wind upon drums driven by a 300-h. p. motor, mounted on the beam. The machinery for opening and closing the bucket is also carried at the rear end of the walk- ing beam and consists of a 100-h. p. motor geared to a drum upon which the operating ropes are wound. The ropes. from this drum are _ carried from the walking beam over deflecting sheaves at the top of the bucket leg and attached to an operating mech- anism located in the leg above the se ae $8 ge id. th) th: We La) $8 $8 se LZ bas 4a. 8 THE Power House