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Callas MARINE REVIEW. [August 17, The necessary culverts and wells will be made of concrete and lined with glazed brick. There will be three main drainage pumps, of the centrifugal type, with separate electric motors, balanced and driven by vertical com- pound engines, and four steel boilers will be included in this plant. The steel caisson, or floating gate, with all its pumping plant and machinery, is included in the bid for the complete dock; but a separate item covers the steam generators in the central power house, the pumps, engines, dynamos, electrical capstans and winches, and all piping and connections, and all machinery, excepting the machinery in the caisson. The contractor is also required to excavate a channel from the entrance to the dock, and one foot below the table end of the dock, to a point in the harbor where a corresponding depth is reached. The concrete to be used in the dock is to be made of Portland cement; with one part of cement to two parts of sand and five parts of broken stone or gravel, all by measure. Special and stringent specifications are issued as to the seasoning, packing, storage and testing of this cement. The sand and cement is to be thoroughly and evenly mixed dry on close Fig. 5. Details of Electric Winch. = Jer 6 Plan. platiorms, after which a spray of water is to be applied until the paste assumes a proper and uniform consistency. This mortar is them uniformly spread over the previously moistened gravel or broken stone, which has been disposed in an even layer on the platform, and-the whole will be turned over at least three times and thoroughly mixed. This concrete will ibe deposited in the work in layers not exceeding 9 inches in thickness and thoroughly rammed. To avoid all horizontal joints in this concrete work, the contractor is required, where the concrete is not too deep, to take up for construction a length that can be completed in one day, and finish off in steps to where the werk is to begin on the following day. He must then start the work in a bed of 2 inches of neat cement, after the surface has been well cleaned. All concrete started on a dry surface must be bedded in this 2 inches of neat cement. No concrete can be used after it has commenced to set; and after it is in place and rammed, no stepping, 7500" on Coping to outer Gate Sill Tes Vin orate outer Oaie iil 2 feet thick, 8 feet wide and 4 feet long, and they must have a smooth surface. Headers must occupy at least one-eighth of the face area of the walls, and hold their width so as to be at least 2 feet wide at the tail. The invert is to be 3 feet deep, and granite is to be used at the ends which show in the dock and receive the thrust and wear of shores, and limestone between these ends. The meeting faces for the caisson must be dressed perfectly smooth so as to form watertight joints; and the stone must be worked out to form all angles. 5 As shown on the drainage plan, there will be four longitudinal subfloor culverts, extending from the head of the dock to near the abutment, where they join a semicircular. cross drain of 6 feet radius. The subfloor drains have concrete floors and sides; and the cross-drain has a concrete floor and arch, stiffened under the keel blocks with steel I-beams; the cross-drain opens into the sump of the 8-foot main drainage culvert leading to the pump well. The entrance to this main drain is covered with an iron grat- ing, 10 by 16 feet, with openings exceeding the total cross-section of the main drain. Another 8-foot circular culvert of concrete, lined with glazed brick, similar in all respects to the main drainage culvert, will lead from the pump well, through the foundations of the dock and connect, 68 feet beyond the axis of the dock, with a drain leading to the old dry dock, No. 1. Both of these main drains, at the points of entrance into the wall © ) K * % O.5 FS t » ; Z a i UY Sectional Elevation. chamber, will be closed by balanced gate valves mechanically operated from the working floor of the pump house. The emptying culvert leads from the pump house through the entrance wall to the dock; and this cul- vert rests on timber foundations and is of semicircular cross-section, with a radius of 9 feet 6 inches. The pump house and well are built of mascnry. with a cast iron floor and a steel frame roof covered with glass and copper. The concrete foun- dation is about 50 feet 6 inches diameter, anda about 21 teet deep, resting on gravel and clay about 60% feet below the coping level. In this Port- land cement concrete base is a water chamber, about 30 feet long, and formed by a brick arch of 12 feet radius and an invert of 24 feet radius. One end of this chamber connects with the 8-foot main drain from the new dock; and the 8-foot drain leading to dock No. 1 communicates with a branch chamber, of similar dimensions, leaving the main chamber about at its center. The suction pipes of the three main drainage pumps enter this chamber through the arch. Above this concrete base rises the circular 256 : 07 --- 56" Longitudinal Stairs Section. ay Se a Ss a ee ee we a a44+¢+ Wa bramage Holes i Foor, 300"G.t06. eee pepe nnn | si a i BE cai - --- ee working on, or walking over it will be permitted for at least twelve hours after it is deposited. __ The stone masonry and lining in this dock will be granite in all wear- ing parts; but where covered by concrete the invert may be granite or limestone. The stone masonry of the walls and entrance will be laid in continuous courses of ashlar, patent-hammered on the face and 6-cut. Beds and joints must be dressed to form 36-inch joints, and the whole will be Jaid in Portland cement mortar, made one part cement to two parts of sand. The face joints must be picked-out to a depth of at least 14-inch, and then pointed with Portland cement mortar, one cement to one sand, well pressed in and finished. The coping stones are not to' be less than st a ee es ae ee a a pop --n-t 1e Fig. 1. General Plan and Longitudinal Section. wall of the pump house, 48 feet 6 inches diameter, laid with hard burnt red brick in Portland cement, and faced inside with white glazed brick; the outer face of this well will be protected by 1 inch of asphaltum applied hot, and the inside surface o: the wall must remain dry. About 8 feet above the concrete base there will be a steel frame and cast iron grating working floor. The superstructure of the pump house will be about 49 feet outside diameter, and 20 feet high, provided with doors, windows, gallery, stalts etc. The walls will be rock-face and 6-cut granite, and glazed brick will be used for an inside lining. The pumping plant will include three independent centrifugal pumps; with separate motors, for pumping out the dock; and one centrifuga