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September, 1909 THE Marine REVIEW Westinghouse Propeller Testing Apparatus. OR the of carrying out a series of tests of pro- pellers™. in purpose connection with certain turbine experiments, George Westinghouse, Pittsburg, has constructed the apparatus illustrated herewith. The circular tank of reinforced con- crete shown in Fig. 1 has fitted to it a long sleeve, similar in general to the. ordinary stern tube of a ship and pro- jecting some distance into the tank, and at such an angle as to closely varied, and thus the current or feed flowing to it may be constrained to a path nearly exactly parallel to the pro- peler axis, or at a more obtuse or more acute angle, still further ap- proaching the working conditions of the ship. Mr. has Westinghouse, who very generously furnished Ture Martne Re- view with the photographs and draw- ings from which the illustrations were made, adds the following: arrangement illustrated the 'in the connecting the overhung casing to a platform scale at the side, as indicated' in the illustrations. The outer casing is fixed, and simply collects the steam and delivers it to the exhaust pipe. "The thrust on the propeller is meas- ured by means of an hydraulic thrust block, best seen in Fig. 2. This con- sists of a couple of discs keyed to the shaft, and having between them a col- lar fixed to the casing, a second fixed colar being provided. behind the sec- ond disc. Two oil-pipes supply oil under pressure to the interspace be- tween the fixed collars and the discs on the shafting, keeping the two from coming into contact with each other, Fic. 1--GerNERAL ARRANGEMENT OF WESTINGHOUSE PROPELLER simulate the actual working conditions existing between the propeller and the skin of the actual ship. The action of the propeller sets up a current move- ment in the tank, the ve'ocity of which is measured by a set of paddles mount-, ed on a vertical shaft and carried around with the water. This velocity is dependent on the propeller and the skin friction of the tank, and may be varied within limits by the proportion- ing of the propeller, and thus the actual working conditions may be closely approximated. The position of the propeller in the tank may also be propeller is driven by a turbine having two casings--an inner and an_ outer one. The inner casing is carried by an overhung journal, as best seen in Fig. 2. This journal is hollow, and the steam supply is admitted through it, leakage being prevented by spring ring packings of the usual type. The noz- zes (Fig. 2) are formed in the over- hung casing and the reacting of the steam from them produce a_ torque, tending to rotate the casing in_ ball bearings, and this torque is exactly equal to the opposite torque exerted on the turbine wheel. It is measured by TESTING APPARATUS. but the An oil, transmitting the end thrust from moving shaft to the fixed casing. overflow conveys away the spent fresh supplies being simultaneously forced in by a suitable pump. The thrust transmitted to the casing is transferred to the platform of a scale by the bell-crank lever shown. "To permit of the free, though lim- ited, axial movement of the propeller- shaft, which is necessary if the thrust is to be accurately recorded, the shaft is connected to the turbine shaft by a coupling, the construction of is best seen in Fig. 2. This flexib'e which