US1035958A - Protective apparatus for radiotelegraphic stations. - Google Patents

Description

E. GIRARDEAU.

PROTECTIVE APPARATUS FOR RADIOTELEGRAPHIC STATIONS.

APPLICATION FILED MAY 26, 1911.

1,035,958. I Patented Aug.20,1912.

Fig.1.

At tor neg.

EMILE 'GIRARDEAU, OF PARIS, FRANCE.

PROTECTIVE APPARATUS FOR RADIOTELEGRAPHIC STATIONS.

Specification of Letters Patent.

Patented/\ug. 20, 1912'.

Application filed May 26, 1911. Serial No. 629,686.

To all whom 1' t may concern.

Be it known that. I, can. (luc'mnrnw, a

citizen of the Republic of France, residing antenna'A isfexcit'ed indirectly by means of at Tesla transformer 1. S and is connected to earth by the intermediary of a gap C from the terminals (.f which the primary of the reception jigger J is branched, its secondary circuit being closed upon the detector I). In these conditions if the. transmitting apparatus does not work and if the electromagnetic waves coming from an operative station excite the antenna A the gap C does not permit ofthe direct passage of the current then circulating.between this antenna and the earth and this current being obliged to circulate in the primary of the jigger J the signals emitted from the transmitting station are recorded by the detector I). It,

on the other hand, the station is rendered operative by means of the oscillating circuit containing the sparkgap I and the primary 1" of the Tesla transformer and it the sparking distance in C is sufficiently small a spark is struck: bet-ween the eiectrcdes of this gap and short circuits the primary of the jigger at the terminals of which the tension cannot in any case exceed the mine corresponding 40 to the sparking distance in C. This distance, cannot, however, be reduced beyond a certain value without set-ting up a permanent short circuit in 'C, for example, owing to a deposit produced by the passage. of the spark, a deformation of the electrodes and so forth. It. follows that the detector D should be relatively strong, that is to say, in general not very sensitive. as it. should not be injured when a tensioning of the nature of the magnitude of the sparking tension of the break is applied to the terminals of the primary of the jigger J. The arrangement contemplated by the present invention obviates this defect. and renders it possible to employ sensitive detectors.

Figs. 1 and 2 of the accompanying draw ing represent two diagrams of my improved arrangement.

From the labors of H. Hertz and other experimenters it is known that the explosive potential of a spark gap is lowered considerably by the actioii of ultra-violet. light. This ultra-violet light. can be furnished by an;oscillating spark, a vacuum tube and so forth. Aecm-dingly if the break is located (l lig. t) in proximity to the spark gap I itself of the primary oscillating emission circuit when this gap becomes operative it autonmtically lowers the explosive potential in and emisequentlv largely re duces the strain on the. detector I). Instead of utilizing the infllience of the gap E directly a vacuum tube or a. neon tube '1 (Fig. 2) can. be employed for example being branched either off the extremities of a portion of the. primary circuit or of the secondary CllCllltZOl' even otf the terminals of the gap'E and so on. ()bviousiy the illumination. of this tube during the operation of the emission system produces the desired effect. r.

It will be obvious that numerous modifications may be devised without altering the principle of the invention; when the method of mounting illustrated. in Fig. 2 is employed for example the tube T can be furnished with a tension limiting device.

What I claim and desire to secure by Letters Patent of the United States is z- 1. In a radio-telegraph station, a receiving apparatus, a transmitting apparatus, a device including a spark gap for protecting the receiving apparatus from the waves radiating from the transmitting apparatus, and means for generatin ultra-violet rays of light in proximity to t e spark gap.

2. A receiving apparatus in a radio-tele- I graph system including means for detect-- mg waves froma distant'station, a device including a spark gap for protecting said apparatus from the-waves transmitted at its own station, and means generating and utili'zingthe action of ultra-violet rayspf light upon said spark gap.

In a radio-telegraph system a 'receiv-' ing apparatus, a transmitting apparatus ineluding a spark gap,,means including a spark-gap for protecting said receiving apparatus from the waves of said transmitting apparatus disposed with said spark gap in" such proximity to the spark gap of the transmitting apparatus that the spark gap paratus- J .of the Protecting means is subject to the aeand means whereby said transmitting a 10 tion 0 the ultra violet rays generated by pmtus generates ultraviolet rays of lig t thespark-.gep of the transmitting epf 1n roximity to said spark up.

" ntestimony whereofln my signature 5 4. In a radio-telegraph system, a receiw. inpremnoe of two witnesses.

in; epperatum'eitransmitting eppmtuq-u' EMILE GIRARDEAU.

devicemcluding e spmk gm for rotectibg said receiving apparatus om t e waves H. C. Coxn,

genera ted'hy said transmitting apparatus, Jomw BA'linn. 1

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