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March, 1913 angles. The bottom inside and out and also the first two courses on the outside of the wings. are sheathed with 15-lb. steel plates; the remainder of the plating is 12.5-lb. except the outside upper course on the wings which is 9.8-lb. The bulkheads are double 15-lb. plates stiffened by 3 x 4- in. 7/.2-lb. vertical angles. spaced 3 ft. apart. The bilge of the dock is protected by a 6 x 9-in. oak wearing strip. There is a Sits overhanging walk at the top of thé wings: this makes a 9-ft. passageway along the top of the dock protected by a steel railing on both sides. The general design of the keel blocks is shown in Fig. 2. They are of oak of the usual type. A rather novel method of moving them back and forth along the ways has been adopted. Each block is connected to two glavanized chains which lead under sheaves and up the side of the dock to the top of the wings; the blocks are moved simply by hauling at. the ends of the chains. The. keel blocks are spaced on 5 ft. centers, there. being 13 in each section , of the dock. Each section is equipped with an electric-driven turbine pump and the entire dock can be pumped out in about two hours. The details of the pump and motor connections are given in Fig. 4. The pump is at the bottom of the dock and the motor at the top of wings, where it is readily accessible. The two are connected together by a 2-7/16-in. vertical shaft; the shaft is made in two sec- tions, one being 18 ft. 1 in. and the other 5 ft., 7% in. between couplings. It is carried in three steady bearings located as indicated in Fig. 4. The pump is provided with its own, thrust bearing. The pump is of special design for working at constant efficiency under varying heads and was manufactured by the Rees Roturbo Mfg. Co., Ltd., "THE MARINE REVIEW 81 Wolverhampton, England, the Ameri- can rights being controlled by the Manistee Iron Works, Manistee, Mich. It is a true turbine pump and has a 12-in. suction and discharge. At 20-ft. head it has a rated capacity of 3,060 gallons per minute; this is increased to 4,220 gallons at 14-ft. head and to 5,080 gallons at 6-f. head, 9 ine foregoing capacities are based on a speed of 950 r. p. m. The load being constant, the pump requires 25 brake horsepower to operate it, and is con- nected to a 25-horsepower Ft. Wayne 220-volt direct current motor. The pump control valves and motor con- troller are located in shelter houses at the top of the dock. Two of these may be seen at the right in Fig. 1. Each section is provided with a junc- tion box where connection is made with the.main transmission line lead- ing to the power house. The pumps are operated independently of one another, each one pumping out its own section of the dock. When in operation there is a man in each pumphouse working under the direc- tion of the dock superintendent. Charles W. Cook, purchasing agent for the Crosby Transportation Co., Milwaukee, has invented an im- proved life raft consisting of a se- ries of air-tight galvanized iron tanks bound together in framework. Mr. Cook has demonstrated a _ working. model to the local inspectors of steam vessels at Milwaukee. The Sperry Gyroscope Co., of New York, has been awarded contract by the navy department for eight gyro- scopic battleship compasses at a cost of $10,000 each. The Heyl-Patterson Construction Co. has: given contract to build a $150,000 addition to the Northwestern Fuel Co.'s dock No. 1 at Superior. a | Sank th ot nat tee aie Yo oy Ez=<3 be ee & ) & 6---3-- -------- fread GaLre say fs FIG, 5--PLAN OF SUCTION' MANIFOLD |