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Equipment Used Afloat and Ashore Rudder Streamlined and Fully Balanced—Complete Line of Digging and Handling Grab Buckets from 1%. to 1614 Cubic Yards MONG post war developments in ship propulsion has been the dis- covery that the dissipation of power abaft the screw is much greater than had been anticipated and_ several methods of recovering a portion of the lost energy are now available. The Balanced Reaction rudder, spe- cially designed for new single screw vessels is not only streamlined and fully balanced but in addition derives a small auxiliary thrust or reaction from the rotation in the propeller slip stream. Owing to simplicity of de- Balanced Reaction Rudder Fitted to Motorship Armadale sign, the costs of construction and upkeep are low. It is claimed by the manufacturer, the Balanced Reaction Rudder Co., 26 Fenchurch street, London, E. C. 3, England, that the rudder will effect an economy in fuel consumption of not less than 10 per cent, for a given speed, and that it will give an increase in speed of not less than four per cent on the same consump- tion. This claim is based on meas- ured mile and service performances of every vessel fitted with the rudder. To date over 116 ships, aggregating over 652,000 deadweight tons, have been equipped with the rudder. Hither the single or double plate construction may be used, depending on the conditions of service involved. The open type of stern frame is used and the stresses on the rudder main- piece are reduced to a minimum, the solepiece being strongly canted up and stiffened. The rudder is shipped and unshipped in the same way as the ordinary rudder. The propeller can be removed in the event of dam- age and a new propeller fitted with- out disturbing the tail shaft. George B. Drake, 17 Battery place, New York, is agent for the United States Atlantic and Gulf coast dis- tricts. Branch offices are located at 664 North Michigan avenue, Chi- cago. Buckets Produced in Wide Range of Sizes ELLMAN ENGINEERING CO., Cleveland, which recently ac- quired the clam shell bucket busi- ness of the G. H. Williams Co., is pro- ducing a complete line of buckets from the very smallest to the largest and for every purpose. The range of sizes is shown in the accompanying illustration of a % cubic yard dig- ging type alongside of the world’s largest coal-handling grab bucket of 16% cubie yards capacity. Special buckets of the power-arm and multiple-rope types are built for unusual conditions such as wood and_= stone grapples, open-hearth cinder, limestone and slag. Single-line, hook- on, cableway, dragline, as well as the largest cleanup buckets for bridge-type cranes for handling coal or iron ore with spreads of scoops up to 24 feet are includ- ed in this line. Some of the outstanding features of construction of the standard buckets are: Large one-piece _ full width hinge which keeps the scoops in perfect alignment; rigid ‘‘A- frame’’ formed by rug- ged corner bars forged from a single steel billet with the bearing in- tegral; extended corner brackets which bring the corner bar bearings out beyond the backs of the scoops adding extra leverage; narrowed head of cast steel and rolled steel plate for resisting the twisting strains of tough digging; the Wil- MARINE REvirew—April, 1932 liams tandem arrangement of pow- er-arm sheaves’ giving a straight line closing pull, conserving the pow- er for the digging, and the straight cable leads which reduce the cable | costs; new type extra long roller rope guards and transverse roller protect- ing the cable by rollers on all sides reducing wear to a minimum; bronze bushings for all moving parts read- ily accessible and easy to remove. In the line of Lubrotite valves made by the Reading-Pratt & Cady Co. Inc., Bridgeport, Conn., a duct system is used for introducing a lubricant-seal between the seating surfaces, insuring tight seating at all times, even though seating surfaces have become scratched or badly injured in service. The seating surfaces are protected by a film of lubricant and will not cor- rode, scratch or become injured as easily as nonlubricated valves. The lubricant-seal separates the wedge from seats slightly, freeing the wedge that has become set for a long period of service. These valves may be used for replacement service without chang- ing the pipe system in any way. All valves seat tight without the use of the lubricant-seal and can be so used. Williams Digging Bucket of %-Cubic Yard Capacity Contrasted with a 16%-Cubic Yard Coal-Handling Grab Bucket 61