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ee eNO Rn Ae Sk ete SE ve re 26 MARINE REVIEW. [May 24, NEW SIX-FEED AUTOMATIC OIL PUMP. Manzel Bros., No. 87 Van Rensselaer street, Buffalo, N. Y. have received orders for several of their six-feed oil pumps from the Wotth- ington Co., London, to be placed on pumping engines at the Paris exposition. A view _ of the pump is given herewith. OILFILLERS Six pumps are yoked to a common piston rod below the oil tank, and each has a sepa- rate sight feed and regulating valve at the top of the tank, so that a different amount of oil may be fed from each pump if desired, the variation being made in the quantity of cil sup- plied to the various pumps from the common tank. 'The utility of this device on ma- chines which vary greatly in the use of oil, will be readily perceived. The Manzel pump is receiving marked favor from a large number of concerns 11 this country, but this is the first occasion on which it has been selected as a part of an exposition exhibit. Among users of this pump well known to readers of the Review are the 'lonawanda Iron & Steel Co., Tonawanda, NY. Carnegie steel Co, Calumet & Hecla Mining Co., Snow Steam Pump Co. o Buffalo, and Hingston & Woods, dredging contractors also of Buffalo. Circulars dealing with sizes, prices, etc., will be furnished upon application to the manufacturers. SIGHT FEES REGULATING VALVES 2) CONNECTING ROD COUPLING Joseph A. 'Donohoe, IW. J. Dutton, C. de Guigne, E. E. Kentfield and A. M. Simpson have incorporated the Mission Rock Co. and the San Fiancisco Dry Dock Co. The former corporation is capitalized for $1,500,000, of which $2,500 has been subscribed, and the dock company for $300,000, of which $500 has been subscribed. The company proposes purchasing Mission Rock, establishing warehouses, building a dry dock and to carry on a general shipping business. ANOTHER EXPERIMENTAL STATION. The North German Llody Steamship Co. has opened a tank for trials of ships' models, or a "towing experimental station' as it is called, at Bremerhaven and has invited the German navy and German ship yards to make use of it. Emperor William visited the station recently and complimented the steamship company on its enterprise. Naval archi- tects know that great outlays are required for such stations; that the first of them was designed by the engineer, W. Froude, for the English Admiralty, and was erected at Torquay. His son, R. E. Froude, built an improved station at Portsmouth. The next was constructed by the Dennys' ship builders of Dumbarton, Scotland. There are now such stations in Holland, Italy, Russia, France, and the United States, all of which, excepting the French station and the station at Washington are modeled after Froude's. The Lloyd station is said to have some im- provements over any of the others. The North German Lloyd station at Bremerhaven covers 2,000 square meters of ground. There is a hall 170 meters long, which includes the model foundry, the machine for shaping the models, the electric stor- age batteries which supply the towage power, a magazine, workshop, drawing-room and offices. There is also adjoining this hall a filter plant with forty square meters filtering surface to supply water for the towing tank. The tank has an interior length of nearly 160 meters and a depth of 3.2 meters, and is 6 meters 'broad. It contains 2,900 cubic meters of filtered water. The walls are wooden and are extraordinary stable to prevent oscillation. oe. In making the towing experiment the practice 1s the same as in other similar tanks. A paraffine modeleof the ship to be built is molded and cut according to an approved design. It is then towed by the electric motor, which moves on a track 'beside the tank, while a dynamometer measures the resistance. The model is cut and recut and remolded time and time again, the displacement remaining the same. The object is to ascertain what length, breadth, depth, height of load line, etc., are best adapted to secure the required speed, loading capacity, and radius of action. The models are 4%4 to 5 meters. long. They may be of wood, but paraffine is usually preferred, owing'to its 'being easily shaped. There are formulas to determine the friction. offered by the waves and other movements of the surface of the sea, and the results so ascertained are also corrected by experiments in which these movements are simulated. The form of screw is also determined on by similar methods. U. S: Engineer Office, Customhouse, Cin- cinnati, O., May 16, 1900. Sealed proposals for hire of one or more Dredging Plants, each consisting of one Dredge, one Towboat and Three Dump Scows, for use on Ohio River, will be received here until 2 p. m., June 15, 1900, and then publicly opened. Information furnished on application. Wm. H. Bixby, Maj., Engrs. June 7. THE ONLY PISTON AIR DRILLS That have Double-Balanced Piston Valves are the "LITTLE GIANT" SPECIALLY DESIGNED FOR SHIP BUILDING.--1hey consume fifty per cent less air and do far more work than rotary or any other type of air drills. If you want to verify this we will send a machine on trial, and pay express charges both ways. Our Machines are made to withstand hard service. They can be operated in a bath of oil. Used by 85 per cent of the railways in this country, Absolutely no vibration. No. J!.--Weight 27 lbs., will drill up to 2% inches in No. 2.--Weight 17 Ibs., will drill up to 114 inches in No. 3.--Weight 8 Ibs., will drill up to ™% inches in Guaranteed against repair for one year. Made entirely of steel. Can be operated close ™ to a corner and in any posi- tion. Wecan furnish them in any size. diameter, ream and tap up to 2 inches. diameter, ream and tap up to J inch. diameter. SEND FOR LATEST CATALOG. STANDARD PNEUMATIC TOOL CO. Manufacturers of Pneumatic Tools of All Kinds, Marquette Building, CHICAGO. 141 Broadway, NEW YORK.