Nikola Tesla U.S. Patent 1,061,142 - Fluid Propulsion Patent Wrapper Page 45

J CECT The 100 H. P. turbine at the Edison plant, as shown in photographs E and F here to annexed was used to drive an alternating current generator through reducing gears, and was equipped with all devices for measuring steam consumption and the pressures of the different points in the path of the steam, and the electrical work done by the generator was accurately indicated by a wattmeter. In many of these instances I have recorded myself the pressures and temperatures of the steam, the speed of the turbine and the electrical performance of the generator, and I have found the turbine to be more economical in stean consumption than any other as given by the guarantee of stcan consumption of well known manufacturers. The tests have shown that thermo-dynamic work is being performed by the steam on its free spiral path through the rotor, a unique feature of these turbines constructed by Mr. Tesla. The 100 H. P. Tesla turbine at the Edison plant, above referred to, is shown in the accompanying photograph E drawing No. 147, and photograph F. The rotor, as shown in the longitudinal section of the said drawing is composed of plane disks riveted together with interstices between them. The sectional view in drawing No. 147 shows the central openings of the disks by which the steam leaves the rotor after having traversed it in its free spiral path. As seen in section at C.D the steam, entering tangentially from above, leaves the rotor at both sides, passing into the exhaust chamber. The following table gives the results of tests made by Mr. Tesla and myself to show the performance of this turbine: -6845