Nikola Tesla Patents
application to and use with exis ting circuits carrying direct currents, such as the ordinary municipal incandescent lighting circuits. The way in which I accomplish this so as to meet the requirements of practical and economical operation under the conditions present, will be understood from a general description of the apparatus which I have devised. In any given circuit, which for present purposes may be considered as conveying direct currents, or those of substantially the character of direct or continuous currents, and which for general purposes of illustration may be assumed to be a branch or derived circuit a cross the mains from any ordinary source - I interpose a device or devices in the nature of a choking coil, in order to give to the circuit a high self induction. I also provide a circuit controller of any proper character that may be operated to make and break said circuit. Around the break or point interruption I place a condenser or condensers to store the energy of the discharge current, and in a local circuit and in series with such condenser I place the primary of a transformer, the secondary of which then becomes the source of the currents of high frequency.. It will be apparent from a consideration of the conditions in val veà, that were the condenser to be directly. charged by the current from the source, and then discharged into the working circuit, a very large capacity would ordinarily be required, but by the above arrangement the current of high electromotive force which is in-299
