US1127368A - Interference-preventer. - Google Patents

Description

T- B. MILLER. INTERFERENCE PREVENTEH. APPLICATION FILED JAN. 6, 1913.

1,127,368. Ptented Feb. 2, 1915.

WITNESSES.

l/VVEIVTOR a? i 7% 72703 5 fl/zZ/ar 6 W I a QzraM/k. Dim/m c/ BY 2 a A TTOR/VEY F SEATTLE'WASHINGTON, ASSIGNOR 0F 0NE HALF I30 THOMAS BURTON MILLER,

nee,

SMITH CANNERY MACHINES COMPANY, OE $EATTLE, WASHINGTON, A CORPORA- TIQN OF WASHINGTON.

INTEBFER-ENCE-PBEVENTEE. I

T all whom it may concern:

Be it known that I, TnoMAs Bnn'ron MILLER, citizen of the United States, residing at Seattle, in the county of King and State of Washington, have invented a certain new and useful Improvement in Interference-Preventers, of which the following arts throughout the a telegraph operator;

is a specification.

My invention relates to improvementsin devices known as interference preventers that may be connected in circuits with a re ceiving apparatus of a wireless telegraph station whereby radiant Hertzian waves, representing signals, which may emanate from a desired particular one of diderent distant wireless telegraph stations that are generating and sending out such waves, may be perceived exclusively and interpreted by and the object of my invention is to provide wireless telegraph stationswith'circuits and apparatus associated there'with which apparatus shall be adapted to be adjusted to be acted upon by the weak electric-waves arriving from a far distant station, or by the weak waves of a nearer station of small power, whereby such waves may be perceived and interpreted by an operator without interference or interruption by stronger electrical waves which at the same time may be emanating from a nearby or from a more powerful distant station. 7

I attain this object by electrical circuits and devices connected therewith which are illustrated in the accompanying drawings, wherein-- 4 Figure 1 is a diagrammatic illustration of circuits and diiferent devices connected therein which circuits and devices comprise the essential features of my invention, while Fig. 2 illustrates, by a view in longitudinal vertical section, three electrical helices and by a view in side elevation it shows a magnetizable core disposed within said helices, which helices and core form a part of my invention.

Like reference numerals indicate like drawings;

Referring to Fig. 1 the primary winding of an air core transformer which is provided with two separate secondary windings 4 and 5.

The lower terminal of the primary winding 3 is indicated as being connected with specification of Letters Eatent.

of the drawings 3 is Patented Feb. 2, igifio Application filed January 8, 1913; Serial No. 740,385.

- the earth 6 while its upper terminal may extend to connect with the antenna of a wireless telegraph station. The secondary winding 4 has its upper terminal connected by a vconducting wire 7 with one terminal of a rectifying detector 8 the other termi nal of said detector 8 being connected with one terminal of an electrical helix 10 by means of a conducting wire 9 the other terminal of said electrical helix 10 being connected by a conducting wire 11 with the lower terminal of said secondary winding 4 while an electrical condenser 12 is connected by one of its terminals to the conducting. wire 11 and its other terminal to the conductin wire 9-.

Similar y ondary winding 5 is connected by conductor 13 with one terminal of another rectifying detector 14: whose other terminal is connected by conductor 15 with one terminalofanother electrical helix 16 whose other terminal is connected by a. conductor .17 with the lower terminal of said secondary winding 5, there being another. electrical condenser 18 which is connected with one of its terminals to conductor 17 and its other terminal to conductor 15.

Within the helices 10 and 16 is movably disposed a magnetizable core 19 whose central portion normally is surrounded by a longitudinally movable helix 20 which may be referred to as the secondary helix of the core 19 while the helix 10 and the helix 16 mav act as the primary coils of said core 19.

The direction of winding of the convolutions of wire of the helices 10 and 16 respectively is such as to cause them to have the tendency to oppose each other in their inductive influence on the core 19 and the helix 20 when both are subjected to the action of like electrical waves.

In practice I have foundit preferable to so construct and dispose in suitable supporting devices, not shown, each of the helices 10, 16, and 20 and the core 19, that each independently may be moved horizontally with relation to the others, whereby the helix 20, of larger internal diameter, may be moved longitudinally in a direction toward either end of the core 19, to surround any desired portion of the helix 10 or the helix 16 as required; or either or both of the helices 10 and 16 may be moved longituthe upper terminal of said s'ecdinally to any position with relation to the core 19 and the helix 20, and thus the core 19 and the helices 10, 16 and 20 may be moved to positions with relation to each other as desired to cause inductive influence of either one of the helices 10 and '16 upon the helix 20 to be neutralized by the other of said helices 10 and 16 whether such inductive influence be direct or through the magne'tizable core 19.

In 'Fig. 2 I have shown by view in longitudinalvertical section one form of the helices 20, 10, and 16 as. disposed on a core 19in a position wherein it electrical waves of a given strength and of like character, be

caused to flow through helices 10 and 16 then no inductive influence could affect the helix20, since the action of helix 1() would neutralize or counteract the action of helix 16, but manifestly if the helix 20, the helix 10, the helix 16 or the core 19 alone be moved, then, in such case, the action on the different distant wireless stations, to represent intelligible signals, find passageway through an',antenna, not shown, to the upper terminal of the primary winding 3 of an air-core transformer and through said primary winding 3 to the earth 6, in a manner well known, .whereby corresponding waves are inductively impressed in each of the two secondary windings 4 and 5, of said air-core transformer, such waves generated in the secondary winding 4 having a tendency to flow through wire 7 to and through the rectifying detector 8 thence through conductor 9 to and through the helix 10 and therefrom through the conductor 11 back to thefsecondary winding 4; and such waves as are generated in said secondary winding 4 are alternating in polarity, but to the extent of its capability the rectifying detector 8 per I mits the passage through it of waves only of the same polarity, thus waves of such same 'rity, comprising what might be describe as an intermittent direct current, reachQQ and passes through the helix 10 by y the way of the conductor 9 while waves of different polarityvfind a passageway of little or no resistance through the 'condenser12; thus the helix 10 is subjected only to waves of one like polarity. Likewise the waves generated in secondary winding 5, passing through conductor 13 to detector 14: to be any waves traversing said helices 10 and 16 could not aflect the helix 20 to make perceptible signals in the receiving telephone 21 but if one distant station be sending-out strong waves while another station is send ing out weak waves and if it be desired to have the receiving telephone 21 affected only by the weak waves of such other station then it would be necessary to adjust one of the two detectors, say detector 8, to rectify strong waves only and then to adjust detector' 14 to rectify the weak waves with maximum 'efl'ect, whereupon the helix 20 should be moved away from the helix 10 toward the helix 16 in the direction indicated by the arrow in Fig. 1, until the strong waves in said helix 10 affect the helix 20 only to counteract accurately the .effect of strong waves in the helix 16, whereby the coil 20 will then be afi'ected only by the weakwaves of like polarity that have been rectified by detector 14' which weak waves will perceptibly affect the receivingtelephone 21.

A movement of the core 19 toward the right or a movement of the helix 10 toward the left for a; required distance may also cause or assist in causing the same result; and obviously the positions of the helices 10, 16 and 20 may be changed to select the waves from any one of the stations irrespective of the. strength of such waves as compared to thefstrength of waves of other stations, provided, of course, all such stations be within the range of the apparatus of my invention.

Manifestly, devices may be applied to the primary winding 3 or to the -secondary windings 4 and 5 for changing the number cuits includes one of said secondary helices, two detectors one of which is connected in veach of said oscillating circuits in series with said secondary helix therein, a condenser connected in each of said oscillating circuits in series with said detector and said secondary helix therein, two primary helices each of which helices is connected with a different one of said oscil lating circuits in parallel with the said condenser therein, a magnetizable core inductively and movably associated with both of said primary helices, a secondary helix movably and inductively associated with said magnetizable core and both of said primary helices and a translating device connected with said secondary helix.

2. In a receiving apparatus of a wireless telegraph station, the combination with a transformer having a primary helix that is adapted to be connected with an antenna,

and having two secondary helices, of another transformer having two primary helices and one secondary helix, each of said primary helices being disposed in electrical connection with a dilferent one of said secondary helices of said first named transformer, two detectors each of which is dis posed in electrical connection with a different one of said two secondar helices of said first named transformer, an areceiving instrument disposed in electrical connection with the secondaryof said second named transformer. a

In witness whereof, I, hereunto subscribe my name this27th day of December A. D., v1912.

THOMAS BURTON MILLER.

I Witnesses:

FRANK WARREN, E. M. T001.

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