The U.S. Patents of Nikola Tesla

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With oscillations still slowerthe earth, strictly speaking, will not resonate, but simply act as 50 capacity, and the variation potential will be more less uniform over its entire surface. More than. The plates and P', through which the electrical energy conveyed the 125 brushes and < /■ ', may considerabledis- tance from each other the ground one in the ground and the other the air, prefer­ ably some height.08484 second and which taken in passing and returning from the region dia­ metrically opposite the pole over the earth’s 60 surface with mean velocity about four hundred and seventy-one thousand two hun­ dred and forty kilometers per second.787,412 3 tricity give rise variety novel and Í striking phenomena, among which are those I already described. The con­ ducting partr good electrical connection with the shaft and provided with taper­ ing which slides brush 110 /•, supported conducting-rod capable of longitudinal adjustment metallic sup­ port «>. the present case this device con­ sists cylinder made partly conducting and partly insulating material < ■and < ■ ', re- 105 spectively, which rotated thodesiral rate of speed any suitable means. 30 First. 35 Second. give an idea, would say that the frequency should be 4° smaller than twenty thousand per second, though shorter waves might practicable. Besides the above three requirements seem to essential the establishment the resonating condition. From the rings extend narrow metallic segments and which by'the rotation 85 the cylinder I. but one plate con­ nected earth and the other maintained j30 . adjustment, of the speed rotation the cylinder < !and a displacement the brush /< ■along the cyl- 120 inder the circuit may made open and close rapid succession and remain open or closed during such intervals time may be desired.) are brought alternately into contact with double brushes and //, carried by and contact with conducting-holders-/* and //, supported metallic bearings and (4', shown. necessary employ oscilla­ tions which the rate radiation energy into space the form hertzian electro­ magnetic waves very small.this, j number facts ascertained clearly ] show that the movement electricity through ! it follows certain laws with nearly mathemat- i ical rigor. Another way connect a tuned circuit the ground two points lying more less meridian passing 70 through the pole or, generally stated, to any two points different potential. Another brush, arranged bear upon the shaft and will seen that when­ ever one the segments/"' comes contact 115 with the brush 1‘the circuit including the re­ ceiver completed and the condenser dis- chargeddhrough the same. The object using two brushes, as and //, each the holders and 95 to vary will the duration the electric con­ tact the plates and with the terminals T and which connected receiving- circuit including receiver Rand device < !, performing the duty closing the receiving- 100 circuit predetermined intervals time and discharging the stored energy through the re­ ceiver. The powerful electrical oscillations the system being com- 5 inunicated the ground cause correspond­ ing vibrations propagated distant j parts the globe, whence they are reflected : and interference with the outgoing vibra­ tions produce stationary waves the crests: io and hollows which lie parallel circles j relatively which the ground-plate may i be considered the pole. 685,953 and 685,955.propagation and 25 transmitting slow electrical oscillations with­ out sensible distortion and attenuation. Third.. For instance, a 65 circuit may connected directly induct­ ively the ground and elevated termi­ nal and tuned respond more effectively to the oscillations.and fourtimesthe frequency the currents. For the present will suffi- j 20 cient state that the planet behaves like j perfectly smooth polished conductor in­ appreciable resistance with capacity and self induction uniformly, distributed along the axis symmetry wave . Theearth’sdiamctcr passing through the pole, should odd multiple the quarter wave length—that is, the ratio be­ tween the velocity light. The lowest frequency would appear six per second, which case there will but one node, ator near theground-plate, and, par- 45 adoxical may seem, the effect will increase with- the distance and will greatest a region diametrically opposite the transmitter. The most essential requirement is, however, that irrespective frequency the wave wave-train should continue foracer- 55 tain interval time, which have estimated to not less than one-twelfth probably 0. Stated other- : wise, the terrestrial conductor thrown into I resonance with the oscillations impressed i 15 upon just like wire. The latter are connected 90 the terminals and condenser II, and it should understood that they are capable of angular displacement, ordinary brush- supports. consists a cylinder of' insulating material, which is moved uniform rate speed clock­ work other suitable motive power and 80 provided with two metal rings upon which bear brushes < 1 and </, connected, re­ spectively, the terminal plates anil P'. The presence the stationary waves may he detected many ways. in Fig. have shown device for detect­ ing the presence the waves such have used novel method magnifying feeble 75 effects which have described Patents Nos.