US1035334A - Wireless telegraphy. - Google Patents

Description

R. A. FESSBNDEN. WIRELESS TELEGRAPHY. APPLICATION FILED JUL'Y19,1909.

1,035,384. Patented Aug. 13,1912.

Q1 INVENTOR.

UNTE STATS UFFIQE.

REGINALD A. FESSENDEN, 0F BRANT ROCK, MASSACHUSETTS, .ASSIGNOR T0 NATIONAL ELECTRIC SIGNALING COMPANY, 0F PI T1011 OF NEW JERSEY.

TTSBURGH, PENNSYLVANIA, A CORPORA- WIRELESS 'TELEGRAPHY.

Patented Aug. 13,1912.

Application filed July 19, 1909. Serial No. 508,442.

To all whom it may concern Be it known that I, REGINALD A. Fnssnw- DEN, a citizen of the United States, residing at Brant. Rock, in the county of Plymouth and State'ot Massachusetts, have invented certain new and useful Improvements in i Vireless Telegraphy, of which the following is a specification.

My invention relates to the art of transmitting energy by electrical oscillations and more particularly to wireless telegraphy, and its primary object is the more eilicient transmission and receipt of energy by electrical oscillations and more particularly the prevention of loss from absorp tion and shielding in transmitting and receiving signals by wireless telegra ihy.

In the accompanying drawing owning a part of this specification the figure shows a sectional view illustrating apparatus for accomplishing the purpose of my invent ion.

This invention is particularly adapted for use where it is desired to locate wireless aparatus within an inclosure having walls of iron or similar material and especially on board battleships where it is desired to locate the Wireless apparatus below the protective deck. Herctotore this has been found impossible, the signals produced and received when the apparatus is placed below the protective deck on war vessels or in a similar situation on other vessels being rendered so weak as to prevent satisfactory working over any considerable distance. As the result of numerous investigations I have (llSCOVQ-IOdtlitlt this weakening is probably due to hysteresis or eddy-current losses set up inthe steel decks or passages through which the wireless leads pass. I have determined by experiment that 'n'ierely bringing a wireless lead within a tuv feet-from a steel plate for a range five or ten feet has a very considerable effect. on weakening the signals. As the result of numerous additional experiments I have discovered that this weakening can be overcome by surrounding the leads with a tube of conducting material, integral or slotted, which tube is preferably formed of copper or silicon bronze and surroundsthe antenna lead orany of the other wireless conductors where they pass through a steel wall or ,in proximity to a wall of steel or similar absorbing material.

In the figure 11 is a compartment of a vessel, 12 being the protective deck and 13 an upper deck.

14 is the water line, 15, 16 are masts for supporting the antenna, 17, 17, 17 is an antenna formed oi a number of parallel wires arranged in'thc shape of an inverted triangle.

18 is the lead from the antenna.

22 is-a high 't'requcncy dynamo and 23 is a receiver.

21 is a switch for connecting the lead 18 either to the high frequency dynamo or to the receiver.

20 is a tube of copper, for example two feet in diameter, which may be integral or slotted as shown for example at 29.

1t), 19 are insulators supporting the lead 18 in the center of the tube 20.

The wireless apparatus may be grounded directly to the frame oi the ship as shown at 22-3 or a switch may be employed as shown at $24 by which tln apparatus may be connected either directly to the frame of the ship or to some conductor running through the walls of the vessel, for example to the copper tube 20 by the lead 25 as shown. The copper tube 20 is also preferably arranged as shown, so that by the throwing of the switch 26 it may be connected to a copper tube 27 which runs over the outside of the vessel and is connected to the copper sheathing on the outside of the vessel as shown at I have experimentally found that by the use of this invention the ditticulties heretofore met with are overcome and the signals are transmitted and received with practic'ally their full intensity. The tuning which was formerly very poor, when the sharp. As an illustration the U. S.

Connecticut lying in the Brooklyn Navy Yard was able to receive signals from Brantllock, ltlassachusetts, at practically undiminished strength, while at the same time entirely cutting out the disturbingsignals from the station at the Brooklyn Navy Yard so that they could not be heard at all.

Having thus described my invention and illustrated its use, 1 claim as new and dcsire to protect by Letters Patent the followln z V The combination with wireless telegmph apparatus, 3113 an ineioeure for said apparatus made of energy absorbing inuterml, of a )rotecting sheath between the conductors o the apparatus and the energy absorbing material composed of a nonubsorbing conductor.

2. The combination with an iron battleship or like inciosure of apparatus for Wireless signaiing including a'conductor enteriug sald inelosure, and a shield of non-absorbing conductor material around said conductor where it passes through or is in proximifiy to the iron of the ship.

'3, The combination with an iron ship or like inciosure, of wireless signaling appa- 15 JESSIE E. BENT, FLORENCE M. LYON.

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