US954640A - Apparatus for wireless telegraphy. - Google Patents

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G. MARCONI., APPARATUS FOB. WIRELESS TELBGRAPHY. AIPILIUATIGH FILED HAE. 31, 1909.

954,640, Patented Apr. 12,1910.

ling

which are carried in UNITED sTATEs PATENT OFFICE.

GGLIELIOQEARJCONI, 0F LONDDN, ENGLAND, ASSIGNOR T0 MARGUNI WIRELESS TELEGRAPH COMPANY 0F AMERICA. 0F NEW YORK, N. Y., A CORPORATION GF NEW JERSEY.

AIP-PARATUS FOR WIRELESS TELEGBAPHY.

Patented Apr. 12, 1910.

Application filed March 31, 1909. Serial No. 487,067.

T o all whom it may concern:

Be it known that I, GUoLiELMO MARC-oni, LL. D., D, Sc., a subject of the King of Italy, residing at lVatergate House, Adel.- phi, London, England, have invented new and useful Improvements in Apparatus for Wireless Tele rraphy, ot which the followA is a spccidization.

This invention relates to transmitting a paratus for wireless telegraphy in which t e discharge takes place across a small gap between discontinuous metal surfaces in rela tire motion at a very high speed.

According to this invention the moving surfaces consist oi' pegs or studs on the adjaCertbtaces of two parallel disks fixed to two shafts in a line with each other and revolved in opposite directions, the shafts be ing mount ,d in insulated bearings. In place of the dis sbeing' parallel they may be sot at an angle but this is not The accompanying dia rain shows a transmitting apparatus madie in accordance with this invention.

a and ai are the tw parallel disks respectively provided with pegs or studs and b and mounted on .shafts c and c' bearings d and el. The studs are preferably equally spaced and the numbers of the studs on the two disks are equal.

e and e are motors or pulleys for connecting to motors, by means of which the disks o and a are driven in opposite diree tions. The bearings fl and cl are insulated from the ground, and the motors or p uliys e and e are respectively insulated from the shafts c and c.

The parallel disks o and a aire connected by means of brushes f and f to the plates of a condenser r/ and this condenser circuit is upled at i to the aerial j. The plates of the c'ondcnser g are4 also connected thr ugh suitable inductancos l.: and to a genlizrator Z so as to form an oscillation cir- Disks two .feet in diameter having two studs and ruiming at a speed of e i elicit 30() revolutions per minute are found to.

work well in practice. It is found moreover that far better results are obtained with studs ot copper than with studs coinposed of any other material.

so advantageous.

i circuit in henrys.

' Sto In order to obtain the best results it is necessary to give suoli values to the condenser g and inductances c and 7: as will make the time period of this circuit equal to or some integral multiple or submultiple of the interval of time between two Successive discharges of the condenser. The time pcriod of this circuit is approximately equal to 2 fn/CIQ where C is the capacity of the condenser in farads and L is the inductance of the whole The interval of time between two successive discharges of the. condenser is equal to LWN (X,{X,) where N is the number of pegs or Studs on either revolving disk, X1, is the number of rcvolu tions per second of one disk and X2 is the number of where m is an integer.

By means of this invention it is possible to discharge the condenser twice as rapidly as with a single revolving disk, while owing to all the pegs on one side being opposite to the pegs on the other disk at the same instant the discharge may take ilace at. any of the By this invent ion 1t is moreover possiv efiiciently utilize a` large amounty o power, and to emit oscillations in regular groups ot' a frequency to which an appropriate receiver may be tuned. and such asto produce in a telephonie receiver a note which isJ readily distinguished from the noises caused by atmospheric disturbances.

What I claim is l. In a wireless telegraph transmitter the combination of two parallel disks, means for rapidly rotating the disks in opposite directions, studs equally spaced around the adpicent. faces of the disks and an oscillation cirrcuit connected to the disks.

Q. In a wireless telegraph transmitter-the combination of two disks having oppositely disposed parallel faces, means for rapidly rotating the disks in opposite directions, an equal number of studs equally spaced around that face of each disk which is adjacent to spaced around that face of each disk which the other disk and an oscillation circuit conis adjacent to the other disk, and an oscilla- .l nected to the disks. l tion circuit connected to the disks.

3. In a wireless telegraph transmitter the GUGLIELMO MARGONI. combination of two parallel disks, means for Witnesses: rapidly rotatin the disks in opposite direc P. C. MAPINI, tions, an equa number of studsequally HENRY W. ALLEY.

Correction 'in Letters Patent No. 954,640.

It is hereby certified that the names of the witnesses tothe signature to the specification of Letters Patent No. 954,640, granted April 12, 1910, upon the application of Guglielmo Marconi, of London, England, for an improvement in Apparatus for Wireless- Telegraphy,"y were erroneously print/ed 1). C. Mapini and Henry W. Alley, whereas said names should have been printed I?. E Maqu-e ami' Henry W Allen; and that the said Letters Patent should be read with thir' correction therein that. the same may conform to the record of the case in thv Patent Oice. l i

Signed and sealed this 3d day of May, A. D., 1910.y l

[mcj A' o. o.V BILLINGs,

l Acting Commissioner ofPatenta.

that face of each disk which is adjacent to spaced around that face of each disk which the other disk and an oscillation circuit conis adjacent to the other disk, and an oscilla- .l nected to the disks. l tion circuit connected to the disks.

3. In a wireless telegraph transmitter the GUGLIELMO MARGONI. combination of two parallel disks, means for Witnesses: rapidly rotatin the disks in opposite direc P. C. MAPINI, tions, an equa number of studsequally HENRY W. ALLEY.

Correction 'in Letters Patent No. 954,640.

It is hereby certified that the names of the witnesses tothe signature to the specification of Letters Patent No. 954,640, granted April 12, 1910, upon the application of Guglielmo Marconi, of London, England, for an improvement in Apparatus for Wireless- Telegraphy,"y were erroneously print/ed 1). C. Mapini and Henry W. Alley, whereas said names should have been printed I?. E Maqu-e ami' Henry W Allen; and that the said Letters Patent should be read with thir' correction therein that. the same may conform to the record of the case in thv Patent Oice. l i

Signed and sealed this 3d day of May, A. D., 1910.y l

[mcj A' o. o.V BILLINGs,

l Acting Commissioner ofPatenta.

Correction ln Letters Patent No. 954,640.

i It is hereby certified that the names of the witnesses to the signature to the i specification of Letters Patent No. 954,640, granted April 12, 1910, upon the application of Guglielmo Marconi, of London, England, for an improvement in Apparatus for Wirelese Telegraphy," were erroneously printed P. C. Mapini and Henry Alley," whereas said names should have been printed I?. E. Maguire and l/emy W Allen; and that the said Letters Patent should be read with this correction therein that the same may coliform to the record of the case in thi Patent Oice.

Signed and sealed this 3d day of May, A. D., 1910.

' C. c.' BILLINGS,

Acting Commissmer of Patents.

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