US1694848A - Sound clarifier - Google Patents

Description

Dec. 1l, 1928. 1,694,848

E. H. FREEBORN SOUND GLARIFIER Filed Sept. 27. 1924 I N VEN TOR.

EDWADH /EEBOR/V.

www

A TTORNE Y.

Patented Dec. 11, 1928.

UNITED STATES PATENT OFFICE.

EDWARD H, FBEEBORN, 0F NEW YORK, N. Y., ASSIGNOR T0 CBNELIUS C. FBEEBOBN,

SR., OF NEW MILFOBD, NEW JERSEY.

soUND cnnm'ma.

Application led September 27, 1924. Serial No. 740,328.

This invention relates to a sound or signal clarifier and more particularly to a novel and improved device adapted to be used in conjunction with a radio receiving set or apparatus. v

'Various meansv have been resorted to in radio receiving sets and circuits toward eliminating static, interference, distortion and other objectionable sounds incident to receiving radio intelligence. Atmospheric conditions, the proximity of aerals and unfavorable broadcasting conditions directly. affect the sound and signals received and amplified. For the most part, experiments and improvements to overcome the above conditions have been resorted to by various instruments and devices in the radio set circuit as by tuning coils, condensers, etc. with buthmited success. After considerable experimenting I have found that the best results can be obtained by clarifying the sounds and signals before they are amplified by what I term a sound or signal filter, introduced in the lead in wire from the aerial.

It is well known that metallic mercury is a very good conductor and emits a vapor at all temperatures. At ordinary temperatures it is a coherent liquid and is only slightly volatile at fifteen degrees. Ether and caxn plior also emit vapors at ordinary temperatures. I have found that by mixing a small quantity of camphor and ether with metallic mercury and confining the solution in a closed tube or container, a very good conductor is'produced having low resistance. The proportion of the mercury to ether and camphor may be varied within certain limits and a solution of about seventy five lpercent of mercury oxide, twelve and one alf percent ether and twelve and one half percent camphor produces a very satisfactory solution.

My theory which has worked successfully in practice is to permit the sound or signal to pass through a conductor such as above described so that the combined vapors with the solution produces a different and altered effect after the sound or signal is amplified. In other words, while the solution acts as a conductor, the resistance produced changes the physical characteristics of the sound or signal so that the objectionable sounds are eliminated.

In order to more fully understand my invention and the results which I desire to accomplish, reference is had to the accompanyin tion an the manner of installing the device.

Figure 1 is a view showing the device installed and its relation to the aerial and receiving set. Figure 2 -is a cross section through the tube or container confining the solution.

Figure 3 is a sectional view taken on the line 3--3 of Fig. 2.

Referring now to the drawings wherein like numerals designate corresponding parts throughout the several views, A designates any conventional type of receivin set or apparatus, B, the sound or signal lter in the line and connected with the lead in wire 5 of the aerial 6.

Referen'e being had particularly to Fig. 2, I provide a tube or container 7, preferably of glass or other vitreous material which is closed at each end by a stopper or cork 8. The tube or container is covered by insulating material 9, preferably rubber or other soft substance so as to protect the same when placed in a easing. The casing consists of two sections 10, 11 which may be lsecured to each other by threaded bolts 12 so as to securely confine the metallic solution and prevent its damage. The tube or container is lined on the inside thereof by a strip of mica 13 which prevents any chemical reaction between the solution and the said tube or container. The tube may be substantially filled with the solution.

As above set forth the solution is con fined within the tube or container, the corks being sealed in any well known manner as by sealing wax 15. The solution consists of a solution of metallic mercury, ether and camphor, there being three parts metallic mercury to one part of ether and camphor.

The solution therefor acts as a conductor as well as a filter between the ends 16, 17 of wire conductors passing through the stoppers or corks 8. n order to prevent the wire conductors from being separated or pulled out of the solution, the ends thereof are provided with a head slightly larger than the opening through the Stoppers through which the conductors extend. The conductors 16, 17 are covered by suitable insulation 18 and connected to the usual binding posts 19, 20.

From the above description seen that my improved device it will be has a direct drawing, illustrating its applicalll e'ect on the sound or signal as it is conducted to the receiving set and while it is in the nature of a resistance device, yet it acts as a clariferb reason of the changes produced in the electrical oscillations incident to the presence of the vapors confined within the tube or container.

Having shown and described my invention, what I now claim -as new and desire to secure by Letters Patent of the United States is:

1. A resistance element for use in a radio circuit comprising a tube, an insulator lining on the interior and exterior surfaces of said tube, a closure for each end of said tube, a metallic liquid solution in the tube consisting of mercury. ether and camphor and an electrode extending thru each of said closures and having its inner end disposed 1n said solution. l

2. A resistanceelement for use in a radio circuit comprising a tube, a lining on the interior an exterior surfaces of said tube, a closure for each end of said tube, a metallic liquid solution in the tube consisting of mercury, ether and camphor, a separablev casing in which said tube is held, and electrodes extending thru said closures and having their inner ends disposed insaid solution.

Images