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148 parallel with one another, with the _ coal piles between them, and the sec- ond that in which the unloading wharf will be at right angles to the loading wharf. The normal capacity will be 240,000 tons, capable of in- crease to 290,000 tons by piling coal to 10 ft. additional height. Pacific Entrance The coaling plant at the Pacific entrance will be on on the quay wall south of the entrance to the large dry dock. The size of the basin will . be 500 ft. long and 250 ft. wide for one design of plant, and the same length and 340 ft. wide for a second design. The extreme tidal difference diere is 21.8 it.- As at: the Atlantic entrance, the loading wharf will be founded upon concrete cylinders rest- ing upon hard rock; the unloading wharf will be gravity section concrete wall resting on rock. The normal ca- pacity of the Balboa plant will be 135,000 tons, capable of increase to 160,000 tons, by piling coal 10 ft. above normal height. The layout is somewhat different from that at the Atlantic entrance, although the methods of handling the coal will be similar. The unloading wharf will be situated at the outer end of the dry dock slip, while the line of the loading wharf makes an. angle of about 45 degrees with that of the unloading wharf, running out toward the canal prism from the end of the unloading wharf. Ta the urct: plana basin 500 <ft. long and 250 ft. wide is provided for, with bottom at 18 ft. below. mean. Hide; and top.of wharf. at..1614 ft. above mean tide. The Capacity of this plant must be not less than 500 tons of coal an hour to be unloaded and 1,000 tons per hour to be loaded aboard colliers or barges. Two un- loaders will be required with con- veyors, and two single stocking re- claiming bridges. Two reloaders will also be required. The operation of this plant is essentially the same as that for the Atlantic entrance. 'An alternate plan for the Balboa plant provides for the same location of the wharves but for a basin 500 ft. long and 340 ft. wide. The un- loaders are the same as in other plans, but instead of dumping into conveyors they will discharge by means of the cantilever end directly into the basin, and large cantilever cranes will then pick up the coal and deposit it at any desired points in the storage basin. For reclaiming, these Same cranes will pick up the coal and trolley it into their towers where it will be dumped into, cars or. other conveyers, whence it will be carried 7 THE MARINE REVIEW away from the basin, along the front of the reloading wharf to the re- loaders. The purpose of this second plan is to make use of four berm cranes now used in the placing of concrete at Miraflores locks, and thus save the expense of the stocking and reclaim- _ing bridges. Whether they will be used depends upon the cost and gen- eral desirability of this plant com- pared with one having entirely new handling machinery. Work at Naval an Factory A larger volume of work for the naval gun factory at Washington and a plea that the increase in pay provided by the last congress for the mechanics at the Washington yard for the fiscal year beginning July 1 next, be placed in immediate operation were urged by a committee of the International Asso- ciation of Machinists at Washington, last Friday. The committee, consist- ing of Thomas E, Carroll, president of the Columbia Lodge of Machinists, and chairman of the legislative committee of the National Association of Mach- inists; M. McGuire and E. R. Pace, called on Secretary Daniels and As- sistant Secretary Roosevelt. Other mat- ters affecting mechanics at the navy yard were discussed as assurance was given the committee that its requests would be considered. Robert. Cure, naval. architect . and marine. surveyor, Port. Arthur, .Ont., has. established . a correspondence - school for instruction in hull survey. His. course is extremely helpful to masters of vessels as it enables them to secure hull surveyor's certificates and fits them for shore positions. He has been extremely busy all winter in this class of work. The Blackmer Rotary Pump, Power & Mfg. Co., Petoskey, Mich., are putting on the market a rotary pump which is meeting with favor aboard ship.-as a bilge pump... It is well fitted for this work and. is. popular. All parts are interchangeable and an entire pump can be bought piece by piece at the price of the assembled pump. The Hyde .Windlass Co., of Bath, Me., is making the molds for the largest manganese propeller ever built in the United States.. It is for a four- ton wheel 18 ft. 6 in. in diameter, and will require 30,000 lbs. of manganese bronze for the casting. The Boston Belting Co. has re- moved its' Chicago offices from. 169 West Lake street to 172 West Ran- dolph street. Ssrr-- Sra RBoRkO,-- / ar SPAR DECK PLAN 5 Sk aga 8 OS ce a ee