Nikola Tesla U.S. Patent 645,576 - System of Transmission of Electrical Energy Patent Wrapper Page 22

140 650,343. Sheet 2. high enough so that the rarefaction of the air at the higher level will be appreciable, it is manifestly incumbent on him to describe some specific devices by which he may attain such elevation of his terminals. At all events, it is necessary for him to give the minimum height or atmospheric pressure at which his invention is designed to work. The Examiner is, however, of the opinion that upon reconsideration the applicant will erase this feature from his specification, for it would seem quite manifest that whatever effects might be attained at a given electrical pressure with an elevation of 15,000 ft., say corresponding to a mercurial pressure of perhaps 15 inches, might be obtained on the earth's surface with a mercurial pressure of 30 inches and a correspondingly greater electrical pressure. Again, applicant refers to the work of Hertz and inferentially also to the work of Edison. He attempts to distinguish from the work of Edison by stating that in Edison's invention the electricity is propagated statically or by induction, whereas the applicant's invention it is propagated by a true conduction. Since he makes this the gist of his invention, it is manifestly necessary to give some proof of this statement. The bare assertion is not sufficient. Edison has an apparatus which to the eye at least is the same as the apparatus of this applicant, excepting merely that the induction coils are wound to produce a higher This page retyped from microfilm for better readability - Ed.]