The U.S. Patents of Nikola Tesla

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100 The various instruments being connected and adjusted the manner described, will now readily seen from the foregoing that under normal conditions, the device being unaffected the disturbances, practically 105 so, and there being only very insig­ nificant amount energy stored the con­ denser, the periodical closure the primary circuit the transformer through the opera­ tion the device will have appreciable no effect upon the primary coil and hence no currents will generated the secondary coil least not such would disturb the state delicate balance existing the sec­ ondary circuit including the receiver, and 115 therefore the latter will not actuated by the battery B'; but when, owing the dis­ turbances impulses propagated through the media from distant source, addi­ tional electromotive force, however small, 120 Created between the terminals the device a the dielectric layers the same, unable to support the increased strain, give way and allow the current the battery . will course understood that the resistance used mainly because of Convenience and that may dispensed with, which case the adjustment may be effected many other ways, deter- 90 mining the proper amount coarseness of the sensitive powder varying the dis­ tance apart the metallic plugs the ends of the tube. sufficient amount energy being now stored this instrument during the time interval between each two succeeding op­ erations the device each closure the 130 primary circuit the latter results the passage sudden current impulse through the coilp, which induces corresponding cur- ■ rent relatively high electromotive force in .to pass through, thus causing difference po- 125 tential the terminals and the con­ denser. advantage to employ round grains powder the tube, and any event important that they should uniform size and shape pos- 35 sible and that provision should made for maintaining unchanging and very dry at­ mosphere the tnbe. Another brush 6', 55 which connected the condenser-termi­ nal T', being arranged bear upon the shaft S, will seen that whenever the brush k comes contact with conducting-segment e the circuit including the primary will be 60 completed and the condenser, energized, discharged through the same. inductive relation to the primaryp secondary coils, usually of much thinner wire and many more turns than the former, which are connected 70 series receiver illustrated ordinary magnetic relay, continuously-adjustable non-inductive resistance r", battery B'of a properly-determined and very constant elec­ tromotive force, and Anally sensitive device 75 a1of the same similar construction a, which likewise rotated uniform speed and which, with its brushes b", closes the secondary circuit. the terminals T and the condenser connected coil p, usually consisting few turns con- 40 ductor very small resistance, which the primary the transformer before referred to, series with device which effects the discharge the condenser through the coil p predetermined intervals time. The tubu­ lar space between the plugs partially filled with conducting sensitive powder, indi­ cated, the proper amount the same and the 20 size its grains being determined and ad- j usted beforehand experiment. The electromotive force of the battery graduated means 80 the adjustable resistance that the dielec­ tric layers the sensitive device are strained very nearly the point breaking down and give way upon slight increase of the electrical pressure the terminals the 85 device.5 685,956 or the air, and order apply this potential difference effectively the sensitive device a the terminals the same are connected to two plates and P', which should as 5 large surface practicable and located in the media that the largest possible differ­ ence potential will produced the dis­ turbances between the terminals the sen­ sitive device. This device the present io case one familiar construction, consisting of insulating-tube, which indicated by the heavy lines the drawings and which has its ends closed tightly two conducting- plugs with reduced extensions, upon which 15 bear two brushes through which the cur­ rents are conveyed the device. This tube I rotate clockwork other means a uniform and suitable rate spepd, and un­ der these conditions find that this device 25 behaves toward disturbances the kind be­ fore assumed manner similar that of a stationary cell celenium toward rays of light, its electrical resistance diminished when acted upon the disturbances 30 and automatically restored upon the cessa­ tion their influence. The same may said the re­ sistance r', which series with the bat- 95 tery and serves graduate the force the latter, that the dielectric layers the sen­ sitive device are -subjected similar strain and maintained state delicate poise. the 45 present case this device consists cylinder made partly conducting and partly in­ sulating material and e', respectively, which is rotated the desired rate speed by any suitable means. The conducting part e 50 good electrical connection with shaft S and provided with tapering segments, /, upon which slides brush which should preferably capable longitudinal adjust­ ment along the cylinder. adjust­ ment the speed rotation the cylinder and displacement the brush along the axis the same the circuit may made to 65 open and close rapid succession and re­ main open closed during such intervals of time maybe desired