Nikola Tesla U.S. Patent 1,061,142 - Fluid Propulsion Patent Wrapper Page 29

} Jom B. a travelling in a spiral path and with continuously diminishing velocity, reaches the orifices 6 and 10 through which it is discharged. 8162 ter. When apparatus of the general character above described is employed for the transmission of power, however, certain departures from structural similarity between transmitter and receiver may be necessary for securing the best result, I have, therefore, included that part of my invention which is directly applicable to the use of fluids as motive agents in a Filed Junciary 17, 1911, serial 90.608.049 ID separate application It may be here pointed out, however, as is evident from the above considerations, that when transmitting power from one shaft to another by such machines, any desired ratio between the speeds of rotation may be obtained by proper selection of the diameters of the disks, or by suit5ably staging the transmitter, the receiver, or both. But it as y be stated that in one respect, at least, the two mechines are essentially different. In the pump, the radial or static pressure, due to centrifugal force, is added to the tangentiel or dynamic, thus increasing the effective head and assisting in the expulsion of the fluid. In the motor, on the contrary, the first named pressure, being opposed to that of supply, reduces the effective head and velocity of radial flow towerds the cenAgain, in the propelled machine a great torque is always desirable, this calling for en increased number of disks and emaller distance of separation, while in the propelling machine, for numerous economic reasons, the rotary effort should be the smallest and the speed the greatest practicable. Many other considerations, which will naturally suggest themselves, may affect the design and construction, but the preceding is thought -6Hey.. 829