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450 outer frame raised so that the outer frame is carried on rollers resting on the inner. The outer frame can then be pulled forward, the operations be- ing continued until the staging reaches the desired place. In practice a third TAE MaRINE REVIEW outer one carried a gantry with over- hanging ends. One of these stages is said to have traveled a total of 3,600 ft. over sand bottom, at a rate of 310 ft: in 10 hours, its stride being 10 ft. Later November, 1910 time the total horsepower of turbine engines completed and under construc- tion in the works of the company and of licensees, as well as in the works of the Continental sub-companies and of licensees of Parsons' Foreign Patents SELF-PROPELLED MARINE STAGE AT WHITLEY Harzor. or rolling frame must be used, this frame acting as an intermediate carry- ing member between the inner and outer frames. The accompanying sketch indicates the relation between the parts of the machine. The inner frame travels on the rolling frame, and the latter, in turn, moves on the outer one. The 'height of the frame- work is 34 ft. It will be noted that the machine can move forward or 'backward and sidewise, and that in this particular apparatus the forward and backward -progress can be made in steps of about 10 ft., while the steps sidewise are limited to about 5 ft. Only four rollers are provided for the lengthwise motion and four for the sidewise, though the inner frame at times carries the outer and at others is carried by the outer frame. This is possible by the use of double tracks, one above and the other below each set of rollers. The spuds are each operated by an independent motor with horizontal shaft carrying a worm engaging a gear placed as a collar around the upper end of the spud. This part of the spud is a threaded shaft, while the lower part is a stout square timber which works up and down inside a 'structural-steel leg, giving lateral strength. The construction plant was mounted mainly on the inner frame, while the Sa pad a rian \ 58 a | when the crew became more experi- enced a 10-ft. step was completed in 15 minutes. The motors operating the Spids ate all controlled from one switchboard so that they can be oper- ated by one man. Both stages were frequently exposed to rough weather without damage. Beside using the machine for blast- ing, rock removal and the construc- tion of piers, it can readily be used for setting caissons, recovering sunken cargo, making subaqueous borings and carrying out a variety of operations in exposed locations where barges would be unsatisfactory on account of their movement or temporary false- work would be expensive or would be endangered by storms. A model of.the staging is being ex- hibited at the United Engineering So- cieties' building, in New York, by C. G. Norris. Progress of Parsons Turbine Some interesting particulars of the progress of the steam turbine are giv- en in the annual report, just issued, of the Parsons Marine Steam Turbine Co. The directors state that the applica- tion of the Parsons type in war ves- sels and in vesseis of the mercantile marine has been greatly extended dur- ing the past year. Up to the present Co. amounts to 4500000. b. -p., an increase during the year of 1,250,000 h. p. Of this total nearly 3,700,000 h. p. are, or will be, employed for the propulsion of warships, and over 800,- 000 h. p. in vessels of the mercantile marine and yachts. The British admiralty took the lead in the introduction of the Parsons type of turbine into warships, and has con- tinued to employ that type in nearly all the vessels laid down during the last five years. At present the total number of vessels built and building for the Royal navy and the colonies with Parsons turbines is 143; the total horsepower is about 2,100,000. In all the important war fleets of the world the lead of the British admiralty has been followed, and the Parsons type of turbine has been largely used in re- cent ships. The United States navy department has adopted the Parsons type for the four large battleships now building, and for 15 destroyers. The French ministry of marine have adopt- ed thé Parsons ftirbine for all the eight first-class battleships now build- ing, and for 10 torpedo vessels. In the German navy all the large armor- ed cruisers recently laid down have Parsons turbines; that type has been adopted also for four protected cruis- ers and eight destroyers. The trials of the armored cruiser Von der Taun, fitted with Parsons turbines, have proved most satisfactory, the speed at-