Nikola Tesla U.S. Patent 685,012 - Means for Increasing the Intensity of Electrical Oscillations Patent Wrapper Page 10

504 pub a' 1. The combination with a circuit adapted to vibrate freely, of means for artificially cooling the same low temperature, as herein set forth. 2. In an apparatus for transmitting or receiving electrical oscillations, the combination with a primary. and a secondary circuit, one of which is adapted to vibrate freely in response to oscillations impressed upon it, of means for artificially cooling the excited circuit to a low temperature, as herein set forth. 3. In an apparatus of the kind described, the combination with the excited circuit, or that on which electrical oscillations are impressed, and which is adapted to vibrate freely, of a receptacle containing an artificial refrigerant in which said circuit is immersed, as herein set forth. 4. The means herein described of increasing the intensity of the electrical oscillations impressed upon a circuit, consisting of an artificial refrigerant combined with and applied to such circuit and adapted to maintain the same at a low temperature. 5. The means herein described of increasing the intensity of the electrical oscillations impressed upon a circuit, consisting of an artificial refrigerant combined with and applied to such circuit and adapted to maintain the same at a uniformly low temperature. Nikole Tesl Witnesses: to a John C. Kexp Mr. Larsson Dyer. -6[This page retyped from microfilm for better readability - Ed.]