Nikola Tesla U.S. Patent 1,061,142 - Fluid Propulsion Patent Wrapper Page 17

J 3 8151 indicated, be made nearly equal to the pressure of supply when the machine is running idle. If the inlet section be large, small changes in the speed of revolution will produce great differences of flow which are further enhanced by the concomittant variations in the length of the spiral path. A self-regulating machine is thus obtained bearing a striking resemblance to a direct Frent electric motor this respect that, with great differences of impressed pressure in a wide open channel the flow of the fluid through the same is prevented by virtue of rotation. Since the centrifugal head increases as the square of the revolutions, cr even more rapidly, and with modern high grade steel great peripheral velocities are practicable, it is possible to attain that condition in a single stage machine, more readily if the runner be of large diameter. Obviously this problem is facilitated by compounding, as will be understood by those skilled in the art. Irrespective of its bearing on economy, this tendency which is, to a degree, common to motors of the above description, is of special advantage in the operation of large units, as it affords a safeguard against running away and destruction. Besides the se, such a prime mover possesses many other advantages, both constructive and operative. It is simple, light and compact, subject to but little wear, cheap and exceptionally easy to manufacture as small clearances and accurate milling work are not essential to good performance. tion it is reliable, there being no valves, sliding contacts or troublesome vanes. It is almost free of windage, largely independent of of nozzle efficiency and suitable for high as well. as for low fluid velocities and speeds of revolution. -11In opera817