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650,109

erably those described in the specification of the patent dated the 27th day of June, 1899, No. 627,650. The wire connecting the receiver to the terminal on the base of the key should preferably be inclosed in a metal tube N to protect it from the oscillations of the local transmitter, and the tube N should be electrically connected to the box R1. This invention is also applicable if the earth connection is substituted by a capacity area. In this case the capacities of the transmitter and receiver should preferably be connected together.

I claim—

1. The combination of the primary and secondary of a sparking appliance, a batter and key in circuit with the primary, an aerial conductor connected to one terminal of the secondary, a receiver, means for connecting the said terminal to the receiver and a capacity connected to the other terminal.

2. The combination of the primary and secondary of a sparking appliance, a better and key in circuit with the primary, an aerial conductor connected to one terminal of the secondary, a receiver, means for connecting the said terminal to the receiver and an earth connection connected to the other terminal.

3. The combination of the primary and secondary of a sparking appliance, a battery in circuit with the primary, an aerial conductor connected to one terminal of the secondary, a capacity connected to the other terminal, a receiver, two fixed contacts one connected to one terminal of the primary and the other to the receiver, a pivoted arm and two contacts on the arm insulated from each other and opposite the fixed contacts one being connected to the other terminal of the primary and the other to that terminal of the secondary which is connected to the aerial conductor.

4. The combination of the primary and secondary of a sparking appliance, a battery in circuit with the primary, an aerial conductor connected to one terminal of the secondary, an earth connection connected to the other terminal, a receiver, two fixed contacts one connected to one terminal of the primary and the other to the receiver, a pivoted arm and two contacts on the arm insulated from each other and opposite the fixed contacts one being connected to the other terminal of the primary and the other to that terminal of the secondary which is connected to the aerial conductor.

Guglielmo Marconi.

Witnesses:
Harold G. Villard,
Edward C. Davidson.


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