Nikola Tesla U.S. Patent 1,061,142 - Fluid Propulsion Patent Wrapper Page 38

838 the Tesla invention from Lundwall. The latter shows a rotating chamber with a central port and a contracted peripheral nozzle. The fact that it is contained within another chamber b is of no moment, as its relations to this chamber are radically different from anything in Tesla's application. Moreover, the chamber b is not a "volute casing" like Tesla's. With regard to the method claims, we would say that the four now presented in lieu of the originals while intended to cover the same ground have been modified in form so as to express more clearly the novel features to which they relate. We think it is undeniable that Mr. Tesla has discovered a principle that is new in its broadest sense. He has pointed out an entirely new way of imparting energy to fluids, different from all old ways in that he effects and operates through hitherto unutilized properties of the same. Tesla imparts energy to fluids neither by impact nor friction nor by centrifugal action, but by taking hold of the outer layers of a body of fluid (adhesion) and moving the whole mass by the resistance which its molecules offer to relative displacement, (viscosity). It is entirely possible that our mode of expression in the claims. may not be altogether happy, and that it might be possible to frame claims which would more completely or exactly distinguish the operation from that effected by such devices as Lundwall. while it may be that our confidence in the propriety of the claims. as drawn is in a measure due to our belief in the radical and revolutionary nature of the invention, we do not see how, as these claims are now drawn, they can fail to be understood as correctly expressing that new principle or method of imparting energy to fluids which we have endeavored to define in a less -5[This page retyped from microfilm for better readability - Ed.] But