Nikola Tesla U.S. Patent 725,605 - System of Signaling Patent Wrapper Page 58

672 order of succession, substantially as set forth. In a wireless telegraph system, the combination of reans for generating a series of magnetic waves of different periodicities, a signal circuit and a circuit controller in said circut, said controller being operated or controlled by a series of two or more magnetic waves, substantially as set 13. forth. 14. In a wireless telegraph system, the combination of means for generating a series of electro-magnetic waves of different periodicities, receiving surfaces of correspondingly different electrical receptivities and a circuit controller arranged in a signal circuit and operative only by the conjoint action of all the voltages or currents generated by the waves from the sending station, substantially as set forth. 15. In a wireless telegraph system, the combination of means for generating a series of magnetic waves of different periodicities, receiving surfaces of liffering electrical recaptivities and an indicating re chanism operative to give an intelligible indication only when currents are induced in the receiving surfaces in a predetermined order, substantially set forth. 16. In a wireless telegraph system, the combination of two orphore surfaces differing with respect of one of the ir electrical constants, means for electrically charging and dischareing said surfaces, and an indicating mechanism operative only. by conjoint action of two or more currents or voltages generated by waves from sending station, substantially as set forth."