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New HE Clark Flexible Coupling Co., I 27 Walker street, New York, has placed on the market an in- teresting coupling suitable for join- ing shafts that are not perfectly aligned. It consists of two sprocket cut flanges held flexibly together by a roller chain, which allows auto- matic adjustment to all positions within the range of the device. This form of coupling is said to give a maximum flexibility in all directions. The rollers of the chain are always in contact with all of the sprocket teeth, insuring an equal distribution of the load with a minimum of. wear. The teeth are provided with clear- ance, so that in case of end motion they do not conflict with each other or with the chain. As indicated in the accompanying illustrations, each chain is securely held in place by a master link. When desired, this link may be removed, thus permitting the shafts to run independently in either TYPE FIG. 1—DOUBLE CHAIN FLEXIBLE COUPLING direction. These couplings are suita- ble for use on shipboard in connec- tion with the operation of electric generators and other auxiliary machin- ery. To Make Propellers The American Manganese Bronze Co., Holmesburg, Pa., has added the manu- facture of propellers to its line. It has engaged the services of the Amer- ican Screw Propeller Co., Philadelphia, to design a set of stock model pro- pellers in the smaller sizes. These will be laid out by Captain Charles W. Dy- son, U. S. N., recognized authority on screw propellers and head of the de- signing department of the engineering bureau of the navy. Captain Dyson, who is associated with the American I WOE Flexible Coupling—Marine Brushes Screw Propeller Co. in the capacity of consulting engineer, is the author of “Screw Propellers and Estimation of Power for Propulsion of Ships,’ a standard work on this subject which a N N ly NS SANG te a a ee es wade eee FIG. 2—-SECTIONAL VIEW OF COUPLING SHOWING POSITION OF SPROC- KETS WHEN SHAFTS MEET AT AN ANGLE was published in 1913. He designed propellers for the battleships OKLa- HOMA, New York, CALIFORNIA, DELA- WARE, TEXAS, ARIZONA, PENNSYLVANIA, IpaHo, and for a number of destroyers. In addition, a large number of yachts ‘as well as tankers, colliers and other merchant vessels have been equipped with Dyson model propellers. Appointed Assistant John E. Deasy has been appointed assistant to J. C. Evans, president of the Great Lakes Transit Corporation, with office in the Marine National Bark building, Buffalo, N. Y. Superheater Installed While there are about 1,500 steamers, representing over 2,000,000 horsepower, hailing from foreign ports equipped with fire tube superheaters, the launching of PEARL SHELL at the ship yards of Har- lan & Hollingsworth Corporation, Wil- mington, Del., represents the first fire tube superheater installation in a new steamer built in this country. PEARL SHELL is an oil tanker, and will be operated by the Shell Oil Co., San Fran- cisco. She will sail out of New York harbor for the present at least. PEARL SHELL is over 400 feet long and represents a gross tonnage of over 5,600. She is equipped with three Scotch ma- rine boilers fitted with Locomotive Superheater Co., New York, fire tube superheaters, supplying superheated steam to triple expansion engines, de- veloping 2,400 horsepower. The super- heater was applied to PEARL SHELL after 298 the purchasers had determined, to their own satisfaction, the economies and re- liability in operation of a superheater of the same design, applied to one of their existing steamers of approximately the same size. The Shell Oil Co. also has contracted for sufficient:‘superheater equipment to convert five more ships. Marine Brushes The John L. Whiting-J. J. Adams Co., Boston, has put on the market a line of brushes for painting and varnishing metals. These brushes are said to wear well under hard usage and are particularly adapted for ma- rine work. The bristles and hair of these brushes are saturated with plas- tic rubber and vulcanized to prevent the hairs from pulling out during use. VULCAN WEAR RESISTING BRUSH Describes Products The American Manganese Bronze Co. has issued an attractive 32-page booklet covering the various types of bronzes which it manufactures. Com- plete physical data are presented, cov- ering each grade of bronze. The booklet makes special reference to Spare’s manganese bronze rods for bolts, shafting, piston rods, etc. for marine service. Bushings, gears, bearings, etc., also are thoroughly described and illustrated. In addi- tion the booklet contains complete directions for melting and pwuring various grades or bronze.