Nikola Tesla - Free-Energy Devices

HIGH FREQUENCY AND HIGH POTENTIAL CURRENTS. 227The small hollow sphere s is filled with some conductingpowder, and a wire w is cemented in the neck for the purpose ofconnecting the conducting powder with the generator.The construction shown in Fig. 142 was chosen in order toremove from the brush any conducting body which might possiblyaffect it. The bulb consists in this case of a lamp globe Z,which has a neck n, provided with a tube b and small sphere s,sealed to it, so that two entirely independent compartments areformed, as indicated in the drawing. When the bulb is in usethe neck n isprovided with a tinfoil coating, which is connectedto the generator and acts inductively upon the moderately rarefiedand highly conducted gas inclosed in the neck. From therethe current passes through the tube b into the small sphere *, toact by induction upon the gas contained in the globe L.It is of advantage to make the tube -very thick, the holeFIG. 143.through it very small, and to blow the sphere * very thin. It isof the greatest importance that the sphere * be placed in thecentre of the globe L.Figs. 143, 144 and 145 indicate different forms, or stages, ofthe brush. Fig. 143 shows the brush as it first appears in a bulbprovided with a conducting terminal ; but, as in such a bulb itvery soon disappears often after a few minutes I will confinemyself to the description of the phenomenon as seen in a bulbwithout conducting electrode. It is observed under the followingconditions :When the globe L (Figs. 141 and 142) is exhausted to a veryhigh degree, generally the bulb is not excited upon connectingthe wire w (Fig. 141) or the tinfoil coating of the bulb (Fig.