Nikola Tesla - Free-Energy Devices

HIGH FREQUENCY AND HIGH POTENTIAL CURRENTS. 337plate P 2On the . primaries are wound secondaries s and s t ,ofcoarse wire, connected to the devices d and I respectively. Byvaryingthe distances of the condenser plates c and c and cl5andc tthe currents through the secondaries s and s tare varied inintensity.The curious feature is the great sensitiveness, theslightest change in the distance of the plates producing considerablevariations in the intensity or strength of the currents. Thesensitiveness may be rendered extreme by making the frequencysuch, that the primary itself, without any plate attached to itsfree end, satisfies, in conjunction with the closed secondary, thecondition of resonance. In such condition an extremely smallchange in the capacity of the free terminal produces great variations.For instance, I have been able to adjust the conditions sothat the mere approach of a person to the coil produces a considerablechange in the brightness of the lamps attached to thesecondary. Such observations and experiments possess, of course,at present, chiefly scientific interest, but they may soon becomeof practical importance.Yery high frequencies are of course not practicable withmotors on account of the necessity of employing iron cores. Butone may use sudden discharges of low frequency and thus obtaincertain advantages of high-frequency currents without renderingthe iron core entirely incapable of following the changes andwithout entailing a very great expenditure of energy in the core.I have found it quite practicable to operate with s.uch low frequencydisruptive discharges of condensers, alternating-currentmotors. A certain class of such motors which I advanced a fewyears ago, which contain closed secondary circuits, will rotatequite vigorously when the discharges are directed through theexciting coils. One reason that such a motor operates so wellwith these discharges is that the difference of phase between theprimary and secondary currents is 90 degrees, which is generallynot the case with harmonically rising and falling currents of lowfrequency. It might not be without interest to show an experimentwith a simple motor of this kind, inasmuch as it is commonlythought that disruptive discharges are unsuitable for suchpurposes. The motor is illustrated in Fig. 182. It comprises arather large iron core * with slots on the top into which are embeddedthick copper washers c c. In proximity to the core isa freely -movable metal disc D. The core isprovided with a primaryexciting coil c athe ends a and b of which are connected to