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J ate and to cause the receiver to be actuated and, inas mich as the skill and practical knowledge in these novel fields can only be acquired by long experience, the degree of of safety and perfection

566 in proximity to them. Adjustable inductances L1 and L2 are preferably included in the primary circuits chiefly for the purpose of regulating the rate of the primary oscillations. In the drawing

pulses or disturbances at any wave length, wave form, number or order of succession, or of any special character, such as will be capable of fulfilling the requirements above stated, and there are

606 the ^ ably chosen periods of vibration, such periods are meant as will secure the greatest safety against interference, both mutual and extraneous. The two systems may have electrical oscillations

47 bration and oscillate freely, each at its proper rate for a certain period of time at every discharge. The two vibrations are impressed upon the ground through the plate E and spread to a distance

608 will be readily seen that the relay R3 will be operated only when both contacts cl and d2 are closed. D The apparatus at the sending station may be controlled in any suitable manner, as for

610 6 trated in Figs. 3, 4 and 5. In Fig. 3 a transmitting system e 3 d3 is partly shunted by a rotating wheel or disk D3, which may be similar to that illustrated in Fig. 1, and which cuts out

614 8,16 sired station, which consists in the transmission of electrical waves or impulses of different periodicities in varying order of transmittal by a separate order or grouping of transmittal for

624 lavelly perhub spec experience, the degree of safety and perfection attained will necessarily depend on the ability and resource of the expert who applies my invention, but in order to enable the