T E (No Model.) No. 512,340. N. TESLA. COIL FOR ELECTRO MAGNETS. Witnesses Ranhail Netter James Fig.1 Fig. 2 Patented Jan. 9, 1894. A Inventor Nikola Tesla By his Attorneys THE NATIONAL LTHorimms

2 Mark Serial Number) 477804 1893. 572,340817 Nikola Teslaur Patent No. Of County of State of Parts of application filed.. Invention Coil for Electro Magnate, te New York, New York (Ex'r's Book, 155

TO ALL WHOM IT MAY CONCERN: Be it known that I, NIKOLA TESLA, a citizen of the United States, residing at New York, in the Count y and State of New York, have invented certain new and useful

4 Oven 2 helices, solenoids, or, in fact, any conductor the different parts of which by the requirements of its application or use are brought in to such relations with each other as to materially

1 ] J 1 J LET 3 13 relatively to the self-induction is very small. POI In order to attain my object and to properly increase the capacity of any given coil, I wind it in such way as to secure a

6 Quen 3 it, and the end of A be connected with the starting point of B, the aggregate length of the two conductors being such that the assumed number of convolutions or turns is the same, viz; 1000

X J or ing, have not been appreciated or taken advantage of. In carrying out my invention it is to be observed that certain facts are well understood by those skilled in the art, viz; the relations of