US2605303A - Ratio type galvanometer - Google Patents

Description

y 1 c. M. HATHAWAY 2,605,303

RATIO TYPE GALVANOMETER Filed Sept. 14, 1950 Patented July 29, 1952 UNITED STATES PATENT OFFICE Application September 14, 1950, Serial No. 184,867

4 Claims.

The present invention relates to a galvanometer element, and more particularly to one which will deflect in proportion to the ratio of two currents.

In a number of instances where oscillographs are employed, as in the case of radio telemetering, it has been found desirable to provide an indication of the ratio of two currents. To conveniently provide such indication it would be desirable to have an oscillograph galvanometer which will deflect in proportion to the ratio of two cur rents.

Therefore, it is an object of the present invention to provide an improved ratio type galvanorneter.

Still another object of the present invention is to provide a moving coil galvanometer element which will deflect in accordance with the ratio of two currents.

Other and further objects of the present invention subsequently will become apparent by reference to the following description taken in conjunction with the accompanying drawing, where- Figure 1 is an enlarged plan view of a portion of a galvanometer element constructed in accordance with the present invention;

Figure 2 is a side view of the element shown in Figure 1;

Figure 3 is a plan view of a galvanometer element and support therefor; and

Figure 4 is a side view of the device shown in Figure 3.

Referring to the drawing there is shown a galvanometer element having a coil H, which is arranged at right angles to a second coil l2. The coil I2 is carried by two spools l3 and I4 placed inwardly a short distance from two similar spools I5 and is, which support the coil H. Mounted on the coil ll is a reflecting mirror I! which is secured thereto by suitable cement. One terminal of the coil H is connected to a wire 2| which engages a lug carried by the spool l5. The other terminal of the coil 1 l is connected to a wire l9, which engages a lug carried by the spool IE. One terminal of the coil [2 is also connected to the wire 2|. The other terminal of the coil I2 is wound in a helical manner to form a short coil I8 surrounding that portion of the wire I9, which is close to the spool 16.

A suitable support plate 22 is provided with a plurality of mounting holes 23. The plate 22 carries a post 24, which is insulated therefrom and which is connected to a binding post 25. Another post 26 is also insulated from the plate 22 and connected to another binding post 21.

One end of the wire I9 is connected to the post 24. One end of the coil IB is connected to the post 25. The other wire 2| is connected to a support 28 carried by an adjusting mechanism 29 contained within a housing 3|, which is provided with a removable cap 32 to give access to the adjusting mechanism.

For the sake of illustrating the construction certain exaggerations have been indulged in since in actual practice each coil is about inch wide and about inch long. In the manufacture of these elements the two windings II and I2 are each wound separately on their respective metal spools, and then the winding I2 is mounted within the winding II and cemented into position. The element and support therefor, shown in Figure 4, is then mounted on a suitable housing, which is carried by a permanent magnet, which provides a concentrated magnetic gap about .050 inch wide.

While for the purpose of describing the present invention a certain preferred construction has been illustrated in the drawing, it is to be understood that such variations are contemplated as may be commensurate with the spirit and scope of the invention set forth in the accompanying claims.

I claim:

1. A galvanometer element mounted between two supports comprising a pair of parallel spools having a winding thereon, said spools being connected to said supports by fine metallic ribbons, a second pair of parallel spools mounted at right angles to said first spools and having their ends contacting said first winding, said latter spools having another winding thereon substantially filling the central space of said first winding, one terminal of which is connected to one of said ribbons, the other terminal being connected to a conductor wound for a short distance about the other ribbon.

2. A galvanometer element mounted between two supports comprising a pair of parallel spools carrying a winding therebetween, said spools being connected to said supports by line metal wires, said winding being conductively connected to said wires, a second pair of parallel spools having a winding therebetween and being mounted at right angles to said first winding, said latter spools and winding being supported by and cemented to said first winding and substantially filling the central space thereof.

3. The combination comprising a support plate having two supports insulated from each other, an insulated binding post, a pair of parallel spools 4. The combination comprising a support plate having two supports insulated from each: other, an insulated binding post, a pair of parallel spools having a winding thereon, each spool: having a support lug, a plurality of metallic ribbons interconnecting each lug with one of said supports,

a second pair of parallel spools having a winding? thereon, said latter spools and said winding sub- 4 stantially filling the central space within said first winding and being cemented into position within said first winding with said latter spools at right angles to said first spools, said first winding being connected to said ribbons, said second winding being connected to one of said ribbons, and a connection from said binding post to said latter winding including a winding extending about one of said ribbons.

' CLAUDE M. HA-THAWAY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2;05'T,845- Pattee Oct. 20, 1936 2,507,301 Fulbright May 9, 1950 20 2,519,591 Morrow -7 Aug. 22, 1950

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