Nikola Tesla U.S. Patent 1,061,142 - Fluid Propulsion Patent Wrapper Page 46

846 R. P. M. 18000 Effective Load 77 H. P. Gage pressure at nozzle 176 lbs. Water consumption per hour. 2700 lbs. Atmospheric exhaust Steam consumed per H. P. hour 35 lbs. The application of vacuum to that turbine at the same load and speed did not change the steam consumption on occount of the small exhaust ports and pipe; from which I draw the conclusion that with an exhaust pressure above atmospheric pressure the steam consumption would have been still better. -7This efficiency of conversion of heat into mechanical power is indeed superior to the best guarantee of any turbine, of corresponding size that I have any knowledge of. The rotor or 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 trubine 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 H.P. 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 regulating attachment on the left hand side of the longitudinal section was replaced in the tests which I witnessed by an auziliary device