The U.S. Patents of Nikola Tesla

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The length the secondary coil of 25 each secondary coil when two are used, in Fig. transformer for developing convert- 75 ing currents high potential, comprising a primary and secondary wound the form of a flat spiral, the end the secondary adja­ cent the primary being electrically con­ nected therewith and with earth when the 80 transformer use, set forth. Witnesses: M. 3. The primary C spirally-wound flat strip surrounding both secondaries B. For such frequency should use a secondary fifty miles length, that one terminal the potential would zero and at the other maximum. 2. Moreover, both primary and secondary are grounded and the line-terminal the coil carried and protected point remote from 60 the apparatus the danger discharge through the body person handling ap­ proaching the apparatus reduced mini­ mum. system for the conversion and trans- 90 mission electrical energy, the combination of two transformers, one for raising, the other for lowering, the potential the currents, the said transformers having one terminal of the longer fine-wire coils connected line, 95 and the other terminals adjacent the shorter coils electrically connected therewith and the earth, set forth. is, before stated, approximately one- quarter the wave length the electrical disturbance the secondary circuit, based on tire velocity propagation the elec- 30 trical disturbance through the coil itself, and the circuit with which designed be used—that say, the rate which a current traverses the circuit, including the coil, one hundred and eighty-five thousand 35 miles per second, then frequency nine hundred and twenty-five per second would maintain nine hundred and twenty-five sta­ tionary waves circuit one hundred and eighty-five thousand miles long, and each 40 wave length would two hundred miles in length.593,138 í> veniently represented supplying tlio pri­ mary the sending step-up” trans­ former, and lamps and motors are shown as connected with the corresponding circuit 5 the receiving step-down transformer. Instead winding the coils the form of a flat spiral the secondary may wound on a support the shape frustum cone and the primary wound around its base, as jo shown Fig. transformer for developing convert­ ing currents high potential, comprising 70 primary and secondary coil, one terminal of the secondary being electrically connected with the primary, and with earth when the transformer use, set forth. 2o The inner terminals the secondaries are led out through tubes insulating material M, while the other outside terminals are connected with the primary. In practice for apparatus designed for or­ dinary usage the coilis preferably constructed on the plan illustrated Fig. 45 Coilsof the characterherein described have several important advantages. 4. the po­ tential increases with the number turns the difference potential between adjacent turns comparatively small, andhence very 50 high potential, impracticable with ordinary coils, may successfully maintained. Mart ling. NIKOLA TESLA. . As the secondary electrically connected with the primary the latter will sub­ stantially the same potential the adjacent portions the secondary, that there will 5s be tendency for sparks jump from one to the other and destroy the insulation. Lawson er, G. I aware that induction-coil the 65 form flat spiral not itself new, and this not claim; but What claim invention is— 1. 2. this fig­ ure are spools insulating material upon 15 which the secondary wound—in the present case, however, two sections, con­ stitute really two secondaries. transformer for developing convert­ ing currents high potential comprising a primary and secondary wound the form of a spiral, the secondary being inside of, and 85 surrounded by, the convolutions the pri­ mary and having its adjacent terminal elec­ trically connected therewith and with earth when the transformer use, set forth