only by an increased number of the coöperative disturbances or series of impulses, but also by a judicious choice of the same and the order in which they are made to act upon 105the receiver.
Evidently there are a great many ways of generating impulses or disturbances of any wave length, wave form, number or order of succession, or of any special character such 110as will be capable of fulfilling the requirements above stated, and there are also many ways in which such impulses or disturbances may be made to coöperate and to cause the receiver to be actuated, and inasmuch as the 115skill and practical knowledge in these novel fields can only be acquired by long experience the degree of safety and perfection attained will necessarily depend upon the ability and resource of the expert who applies my 120invention; but in order to enable the same to be successfully practiced by any person possessed only of the more general knowledge and the experience in these branches I shall describe the simplest plan of carrying it out which is 125at present known to me.
For a better understanding of the subject reference is now made to the accompanying drawings, in which—
Figures 1 and 2 represent diagrammatically 130the apparatus and circuit connections employed at the sending and the receiving stations respectively; and Figs. 3, 4, and 5 modlified means which may be employed in the practical application of the invention.
135In 1, S1 and S2 are two spirally-wound coils or conductors connected with their inner ends to elevated terminals D1 and D2, respectively, and with their outer ends to an earth-plate E. These two coils, conductors 140or systems D1 S1 E and D2 S2 E have different and suitably-chosen periods of vibration, and, as pointed out in other patents relating to my system of energy and intelligence transmission, their lengths should be such that the 145points of maximum pressure developed therein coincide with the elevated terminals D1 D2. The two systems may have electrical oscillations impressed upon them in any desired manner, conveniently by energizing them 150through primaries P1 and P2, placed in proximity to them. Adjustable inductances L1 and L2 are preferably included in the primary circuits chiefly for the purpose of regulating the rates of the primary oscillations. 155In the drawings these primaries P1 and P2 surround the coils S1 S2 and are joined in series through the inductances L1 L2, conductor F condensers C1 and C2, brush-holders B1 and B2, and a toothed disk D, which is 160connected to the conductor F, condensers C1 and C2 are of such capacity and the inductances L1 and L2 are so 165adjusted that each primary is in close resonance with its secondary system, as I have explained in other patents granted to me. The brush-holders B1 and B2 are capable independently of angular and, if necessary, also of lateral adjustment, so that any desired order of 170succession or any difference of time interval between the discharges occurring in the two primary circuits may be obtained. The condensers being energized from a suitable source S, preferably of high potential, and the disk175 D being rotated, its projections or teeth p p, coming at periodically-recurring intervals in very close proximity to or, as the case may be, in contact with conducting rods or brushes n n, cause the condensers to be discharged180 in rapid succession through their respective circuits. In this matter the two secondary systems D1 S1 E and D2 S2 E are set in vibration and oscillate freely, each at its proper rate, for a certain period of time at every 185discharge. The two vibrations are impressed upon the ground through the plate E and spread to a distance reaching the receiving-station, which has two similar circuits or systems e s1 d1 and e s2 d2 arranged and 190connected in the same manner and tuned to the systems at the sending-station, so that each responds exclusively to one of the two vibrations produced by the transmitting apparatus. The same rules of adjustment are 195observed with respect to the receiving-circuits, care being, furthermore, taken that the tuning is effected when all the apparatus is connected to the circuits and placed in position, as any change may more or less modify the vibration.200 Each of the receiving-coils s1 and s2 is shunted by a local circuit containing, respectively, sensitive devices a1 a2, batteries b1 b2, adjustable resistances r1 r2, and sensitive relays R1 R2, all joined in series, as shown. The 205precise connections and arrangements of the various receiving instruments are largely immaterial and may be varied in many ways. The sensitive devices a1 a2 may be any of the well-known devices of this kind—as, for210 example, two conducting-terminals separated by a minute air-gap or a thin film of dielectric which is strained or weakened by a battery or other means to the point of breaking down and gives way to the slightest 215disturbing influence. Its return to the normal sensitive state may be secured by momentarily interrupting the battery-circuit after each operation or otherwise. The relays R1 R2 have armatures l1 l2, which are connected220 by a wire w and when attracted establish electrical contacts at c1 and c2, thus closing a circuit containing a battery b3, an adjustable resistance r3, and a relay R3.
From the above description it will be readily225 seen that the relay R2 will be operated only when both contacts c1 and c2 are closed.
The apparatus at the sending-station may be controlled in any suitable manner—as, for instance, by momentarily closing the circuit230 of the source S, two different electric vibrations being emitted simultaneously or in