sion of energy for any purpose and whatever the medium through which the impulses are conveyed.
What I claim is—
3651. In a system for the transmission of electrical energy, the combination with means for producing two or more distinctive kinds of disturbances or impulses, of receiving-circuits, each tuned to respond to the waves or 370impulses of one kind only, and a receiving device dependent for operation upon the conjoint action of the several receiving-circuits, as set forth.
2. In a system for the transmission of 375electrical impulses and the operation or control, of signaling or other apparatus thereby, the combination with a transmitter adapted to produce two or more distinctive kinds or classes of disturbances or impulses, of 380sensitive receiving-circuits, each tuned to respond to the impulses or disturbances of one kind or class only, and a receiving device dependent for operation upon the conjoint action of the sensitive circuits, as set forth.
3853. In a system for the transmission of electrical impulses, and the operation or control of signaling, or other apparatus thereby, the combination with a transmitter adapted to produce two or more distinctive kinds or 390classes of disturbances or impulses, of sensitive circuits at the receiving point or station, each tuned to respond to the impulses or disturbances of one kind or class only, a local circuit arranged to be completed by the 395conjoint action of the sensitive circuits and a receiving device connected therewith, as set forth.
4. In a system for the transmission of electrical impulses, and the operation or control 400of signaling or other apparatus thereby, the combination with a transmitting apparatus adapted to produce two or more distinctive kinds of disturbances or impulses, of means for varying the time intervals of the emission 405of the impulses of the several kinds, sensitive circuits each tuned to respond to the impulses or disturbances of one kind only, and a receiving apparatus dependent for operation upon the conjoint action of the sensitive 410circuits, as set forth.
5. In a system, such as herein described, the combination with a transmitter adapted to produce a plurality of distinctive kinds of electrical disturbances or impulses, of a 415receiving apparatus comprising a plurality of circuits, a sensitive device and a relay included in each circuit, and each said circuit being tuned to respond to the impulses or disturbances of one kind only, and a receiving 420apparatus in a local circuit controlled by the relays and adapted to be completed by the conjoint action of all said relays, as set forth.
6. In a system of the kind described, the 425combination with a transmitter adapted to produce two or more series of electrical oscillations or impulses of different frequencies, of a receiving apparatus comprising a plurality of sensitive circuits each tuned to respond to the impulses of one of the series produced430 by the transmitter, and a signaling device dependent for its operation upon the conjoint action of said circuits, as set forth.
7. The combination with a plurality of transmitter elements, each adapted to 435produce a series of impulses or disturbances of a distinctive character, and means for controlling and adjusting the same, of a receiver having a plurality of sensitive circuits each tuned so as to be affected by one of the series440 of impulses only, and dependent for operation upon the conjoint action of all said circuits, as set forth.
8. The combination with a transmitter adapted to produce series of electrical 445impulses or disturbances of distinctive character and in a given order of succession, of a receiving apparatus comprising tuned circuits responding to such impulses in a corresponding order, and dependent for operation450 upon the conjoint action of said elements, as set forth.
9. In a receiving apparatus, the combination with a plurality of sensitive circuits, severally tuned to respond to waves or impulses455 of a different kind or class, a receiving-circuit controlled by the sensitive circuits and a device connected with the receiving-circuits and a device connected with the receiving-circuits adapted to be operated when said circuit is completed by the conjoint action of two or460 more of the sensitive circuits, as set forth.
10. A system for the transmission of electrical energy, having in combination means for producing and transmitting two or more impulses of different periodicities to form a465 signal in a predetermined order of succession, as set forth.
11. In a system for the transmission of electrical energy, the combination with a transmitting apparatus comprising one or more 470circuits, means for impressing therein oscillations or impulses of different character and a receiving apparatus comprising a plurality of circuits each tuned to respond to the impulses of one kind produced by the transmitter475 and a receiver dependent for operation upon the conjoint action of the receiving-circuits, as set forth.
12. In a system for the transmission of electrical energy, the combination with a 480transmitting apparatus comprising a transformer and means for impressing upon the secondary element of the same oscillations or impulses of different character, of a receiving apparatus comprising a plurality of circuits each485 tuned to the impulses of one kind emitted by the secondary of the transmitting-transformer, and a receiver dependent for operation upon the conjoint action of the receiving-circuits, as set forth.490
13. In a system for the transmission of electrical energy, the combination with a transmitting apparatus comprising a transformer and means for impressing upon the secondary