Nikola Tesla U.S. Patent 1,119,732 - Apparatus for Transmitting Electrical Energy Patent Wrapper Page 14

710 Canceled per c Per B The frame is carried by a strong platform which is expressly provided for safety appliances, instruments of observation, and which in turn rests on insulating supports F F. These should penetrate far into the hollow space formed by the terminal, and if the electric density at the points where they are bolted in the frame is still considerable, they may be specially protected by conducting hoods a4, similar to those before described. etc., Apart of the improvements which form the subject of this specification the transmitting circuit, in its general features, is identical with that described and claimed in my original patents Nos. 645,576 and 649,621, and in some constructive details with modified arrangement of the same, which has been illustrated in my application of Jan. 15, 43,368 1901, Serial No. 4368, and for which rights have been reserved therein. The circuit comprises a coil A which is in close inductive relation with a primary C, and one end of which is connected to a ground-plate E, while its other end is led through a separate self-induction coil B and a metal lic cylinder B to the terminal D. The connection to the latter should always be made at, or hear the center, in order to secure a symmetrical distribution of the current, as otherwise, when the frequency is very high and the flow of large volume, the performance of the apparatus might be impaired. The primary C may be excited in any desired manner, from a suitable source of currents G, which may be an alternator or condenser, the important requirement being that the resonant condition is established, that is to say, that the terminal D is charged to the maximum pressure developed in 3ri!-- 2.2-- -6