Nikola Tesla U.S. Patent 1,061,206 - Turbine Patent Wrapper Page 38

902 RPM. 18000 Effective Load 77 H.P. Gauge pressure at nozzle 176 lbs. Water Consumption per hour. 2700 lbs. Vacuum at Exhaust 21" Steam consumed per H.P.hour 35 lbs. This efficiency of con version of heat into mechanical power is indeed superior to the best guarantee of any turbine, of corresponding size that I have any knowledge of. of this machine was only nine and three quarter inches in diameter and not more than two inches wide. I recognize photograph E of drawing No. 147 as correctly representing the construction of the said turbine, and photograph F as correctly showing the said turbine in working condition at the Edison power house, and I furthermore know that this turbine was operated in accordance with the instructions and descriptions in Mr. Tesla's applications for patent above referred to. On the left side of photograph F is shown the turbine proper driving through the reduction gear (shown in the center of the photograph), the generator on the right side of the photograph. The two 200 HP turbines mentioned above are shown in photograph G of drawing, No.135, and photograph H, both of which are hereto annexed, with the single exception that the regular attachment on the left hand side of the longitudinal section was replaced in the tests which wish I witnessed by an auxiliary device for measuring torque. Both of these machines were pro - ided with reversing nozzles as shown in the photographs. Their rotors were composed of plane disks riveted together, as indicated, with spaces between them. The steam entered tangentially and, after describing its free spiral path, issued from the: 37 The rotor