Nikola Tesla - Free-Energy Devices

484 INVENTIONS OF NIKOLA TESLA.development chiefly interesting as showing Mr. Tesla's efforts toadapt his system to the existing high frequencies.On the rightside of the table, at are s, T, shown, on separatesupports, larger and more perfected armatures of commercialmotors, and in the space around the table a variety of motors andgenerators supplying currents to them was exhibited.The high frequency exhibit embraced Mr. Tesla's first originalapparatus used in his investigations. There was exhibited aglass tube with one layer of silk-covered wire wound at the topand a copper ribbon on the inside. This was the first disruptivedischarge coil constructed by him. At u is shown the disruptiveFIG. 811.discharge coil exhibited by him in his lecture before the AmericanInstitute of Electrical Engineers, in May, 1891. 1 At v and ware shown some of the first high frequency transformers. Anumber of various fields and armatures of small models of highfrequency apparatus as shown at x and Y, and others not visiblein the picture, were exhibited. In the annexed space the dynamothen used by Mr. Tesla at Columbia College was exhibited also;another form of high frequency dynamo used.In this space also was arranged a battery of Leyden jars andhis large disruptive discharge1. See Part II, Chap. XXVI., page 145.coil which was used for exhibiting