Nikola Tesla U.S. Patent 1,061,206 - Turbine Patent Wrapper Page 28

892 across limited arcs of the disks from an inlet port to an outlet port in direct line therewith. As the portions of the disks upon which such jets or streams impinge travel in a circle while the fluid travels in an approximately straight line, the paths of the two evidently coincide at a single theoretical point only, and at all other points there is lost motion between the two. Evidently therefore the rotary component is relatively feeble as the resistance to rotation is nearly as the impelling rotary force. Of course, the fluid, whatever may be its action or effect, is compelled to follow a given path between inlet and outlet, such path being the extreme opposite to a spiral. The relative velocities of the fluid and surfaces of the disks with which it is in contact are therefore widely different,. and, owing to the enormous slip the losses in such a device, will be prohibitively great. It is assumed that the distinctions above noted will be recognized, but the position of the Office seems to be that because Winkler has a series of corrugated disks with ports at the periphery and center of the casing, and Thrupp is assumed to have plane disks with inlet and outlet ports at the periphery only, Thrupp's disks might be used in place of Winkler's and conversely. A syllogistic anticipation of Tesla is thus made out. If there were no different operation brought about by these substitutions and transpositions, there might be force to the argument, but it is sufficient to point out that if plane surfaced disks were used in the Winkler device and the proper proportion given to the ports, which it may be men27 -5