The U.S. Patents of Nikola Tesla

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find preferable, how­ ever, follow the plan which have illus­ trated and described. 65 will observed that the condenser an important element the combination. this case the energy stored the condenser passed through the primary a transformer the secondary circuit which contains the receiver, and order render 95 the apparatus still more suitable for use in detecting feeble impulses addition the sensitive device which acted upon the impulses another such device included in the secondary circuit the transformer. 3, in which the devices already described are indicated similar letters correspond with those Fig. It allows the energy accumulated be discharged instantaneously, and therefore 70 a highly-effective manner.685,954 cell sensitive device are varied inter­ mitted any arbitrary manner, when transmitting intelligence the usual way from distant station means short and 5 long signals, the apparatus may readily be made recoi’d enable operator to read the message, since the receiver, sup­ posing ordinary magnetic relay, for example, will operated each signal i from the sending-station certain number of times having some relation the duration of each signal. 5—in both of which figures the various devices are let­ tered correspond with those Fig. The four resistances included the branches the bridge— namely, L', aud L"—are suitable 115 size and proportioned that under normal conditions—that is, when the device not influenced all only slightly the dis­ turbances—there will difference po­ tential orinanycase the minimum thesame 120 at the terminals and the condenser. The condenser O', which is generally made considerable capacity, is connected two opposite points the bridge, while battery series with no eontin uously-adjnstable non-inductive resist­ ance ?•', connected the other pair op­ posite points, usual. 20 With reference Fig. will readily seen, how­ ever, that the rays are varied any other way, impressing upon them changes 15 intensity, the succeeding condenser dis­ charges will undergo corresponding changes in intensity, which may indicated re­ corded suitable receiver and distin­ guished irrespectively duration. have shown that reason its unique properties it greatly adds the efficacy this method. that the figures become self-explanatory. magnifies a large degree the current supplied from the battery,and owing these features permits energy stored and discharged prac­ tically any rate desired, and thereby makes 75 it possible obtain the receiving-circuit very great changes the current strength by impressing upon the battery current very small variations. modified arrangement ap­ paratus illustrated which particularly adapted for the investigation and utilization of very feeble impulses disturbances, such as may used conveying signals pro- 90 ducing other desired effects very great dis­ tances. For instance, the sen­ sitive device instead, being series, as 25 shown, may shunt the condenser, this modification being illustrated Fig. may useful to state that the electrical connections the various devices illustrated may made in many different ways. 2, or otherwise connected orrelated; but each case the sensitive device will have the same duty perforin—that is, control the en- 55 ergy stored and utilized some suitable way for causing the operation the receiver in correspondence with the intermittences or variations the effects disturbances, and in each instance judicious selection of Co the devices and careful adjustment the ad­ vantages method may more less completely secured. 85 In Fig. this case will ob- 30 served that the condenser which being charged from the battery through the resist­ ance preferably inductive and properly re­ lated the capacity the condenser, will store less energy when the sensitive device a 35 energized the rays and its resistance thereby diminished. The 100 scheme connections the main that of a Wheatstone bridge the four branches of which are formed the sensitive device a and resistances L', and L", all which should preferably inductive and also ad- 105 jnstable continuous manner least by very small steps. It assumed the present instance that the disturbances investigated utilized are such will produce difference electric po­ tential, however small, between two points 125 regions the natural media—as the earth, the water, the air—and order apply this potential difference effectively the sen­ sitive device the terminals the same are connected two plates and P',which should 130 be large surface practicable and so located the media that the largest possible difference potential will produced by the disturbances between the terminals of . The adjustment the various instruments may then such that the receiver will operated only when the rays are diminished intensity interrupt- 40 and entirely prevented from falling upon the sensitive cell, the sensitive device may be placed, shown Fig. Other means storage possessing these characteristics useful 80 degree may employed without departing from the broad spirit invention; but I prefer use condenser, since these re­ spects excels any other storage device of which have knowledge. Again, the several instruments maybe connected in 50 the manner Wheatstone bridge, will be hereinafter explained with reference Fig. shunt to the resistance inserted any suitable way the circuit containing the receiver— 45 for example, illustrated Fig