Nikola Tesla - Free-Energy Devices

HIGH FREQUENCY AND HIGH POTENTIAL CURRENTS. 173venient to proceed in the following way : First, the wire shouldbe boiled in paraffine until all the air is out ;then the coil iswound by running the wire through melted paraffine, merely forthe purpose of fixing the wire. The coil is then taken off fromthe spool, immersed in a cylindrical vessel filled with pure meltedwax and boiled for a long time until the bubbles cease to appear.The whole is then left to cool down thoroughly, and then themass is taken out of the vessel and turned up in a lathe. A coilmade in this manner and with care is capable of withstandingenormous potential differences.Itmay be found convenient to immerse the coil in paraffine oilor some other kind of oil ;it is a most effective way of insulating,principally on account of the perfect exclusion of air, but itmayFIG. 113.be found that, after all, a vessel filled with oil is not a very convenientthing to handle in a laboratory.If an ordinary coil can be dismounted, the primary may betaken out of the tube and the latter plugged up at one end, filledwith oil, and the primary reinserted. This affords an excellentinsulation and prevents the formation of the streams.Of all the experiments which may be performed with rapidlyalternating currents the most interesting are those which concernthe production of a practical illuminant. It cannot be deniedthat the present methods, though they were brilliant advances,are very wasteful. Some better methods must be invented, somemore perfect apparatus devised. Modern research has openednew possibilities for the production of an efficient source of light,and the attention of all has been turned in the direction indicated