Nikola Tesla Patents
500 Pub. a ' of electrical pressure in such circuit, it is desirable to make the inductance aslarge and the resistance as small as practicable. Having this object in view in apparatus which I have heretofore designed for the transmitting and receiving circuits of such sys tens, I have devised and used conductors of special forms and relatively very large cross-section, but in practical experience I have found that linitations to the increase of the inductance, as well as to the diminution of the resistance are imposed by conditions which oppose the attainment of the results desired. This will be understood from the observation that a large inductance in general involves a slow vibration, which entails certain disadvantages, while an increase of the section of the conductor beyond a certain limit, with the object of reducing the resistance, is as a rule of little or no value. It is a well established fact that as the temperature of a metallic conductor rises, its electrical resistance increases, and in recognition of this, constructors of commercial electrical apparatus have long resorted to many expedients to prevent the coils and other parts of such devices from becoming heated when in use, but merely with a view to economizing energy and reducing the cost of construction and operation of the apparatus. Now I have discovered, that when a rapidly oscillating circuit is maintained at a low temperature, the oscillations impressed upon the same are, to an extraordinary degree, magnified, and I am thus enabled to produce many
