US2042972A - Electrical resistance element and alloy therefor - Google Patents
Electrical resistance element and alloy therefor Download PDFInfo
- Publication number
- US2042972A US2042972A US50378A US5037835A US2042972A US 2042972 A US2042972 A US 2042972A US 50378 A US50378 A US 50378A US 5037835 A US5037835 A US 5037835A US 2042972 A US2042972 A US 2042972A
- Authority
- US
- United States
- Prior art keywords
- alloy
- electrical resistance
- resistance element
- chromium
- gold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 229910045601 alloy Inorganic materials 0.000 title description 11
- 239000000956 alloy Substances 0.000 title description 11
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 8
- 229910052804 chromium Inorganic materials 0.000 description 8
- 239000011651 chromium Substances 0.000 description 8
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 7
- 239000010931 gold Substances 0.000 description 7
- 229910052737 gold Inorganic materials 0.000 description 7
- 229910000896 Manganin Inorganic materials 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910000599 Cr alloy Inorganic materials 0.000 description 2
- 239000000788 chromium alloy Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C5/00—Alloys based on noble metals
- C22C5/02—Alloys based on gold
Definitions
- This invention relates to anew and improved electrical resistance element, and is a division of my 4application Serial No. 754,310, filed Nov. 22nd, 193
- resistance alloys have included a number of different alloys composed of gold with the addition of approximately from 1.5 to 5 percent of chromium by weight.
- the first difllculty encountered was to discover a method by which the two ingredientscould be should have low temperature coefilcientsof re-. sistancein order that they maybe readily measof chromium. Specifically, my research and tests sirable mixture is approximately 2.1 percent of properly alloyed, and this method is described and claimed in my co-pending application, to which reference has been made above.
- the coils are usually kept for a year or more in order to reach a reasonably stable state, but with my alloy this ageing is not necessary, and, obviously, is greatly preferable to the manganin.
- An electrical resistance element composed of an alloy comprised of gold and chromium, the chromium being in the'percentage of from one to five percent and the gold constituting the remainder of the element.
Description
Patented June 2, 1936 .ELECTRICAL RESISTANCE ELEMENT AND 'ALLOY THEREFOR James L. Thomas, Garrett Park, Md., assignor to the Government or the United States, as represented by the Secretary of Commerce No Drawing. Original application November 22,
1934, Serial No. 754,310. Divided and this application November 18, 1935, Serial No. 50,378
3 Claims.
(Granted under the act of March 3, 1883, as
mended April 30,
The invention described herein may. bemanufactured and used by or'fortheGovernment of the United States for governmental purposes only without the payment of any royalty thereon.
This invention relates to anew and improved electrical resistance element, and is a division of my 4application Serial No. 754,310, filed Nov. 22nd, 193
Generally, in electrical measuring apparatus, coils of wire are utilized and difllculty has always beenencountered in obtaining a wire whose resistance remains stable or substantially constant. It is known that resistance changes with age and also with ordinary changes in laboratoryrtemperature. The change which takes place with age may be due to chemical action of the air upon the surface of the wire, or to changes in the crystal arrangement therein.
Further,'besides the stability, resistance alloys have included a number of different alloys composed of gold with the addition of approximately from 1.5 to 5 percent of chromium by weight. As
a result of the tests I have found the most dechromium and theremainder gold- Moreover, I have discovered that the addition of 1.5 to 5 percent of chromium to gold produces alloys having very small temperature coemcients of electrical resistance and that the temperature coefficient of the alloys depends upon the proportions of the two ingredients. f a
The first difllculty encountered was to discover a method by which the two ingredientscould be should have low temperature coefilcientsof re-. sistancein order that they maybe readily measof chromium. Specifically, my research and tests sirable mixture is approximately 2.1 percent of properly alloyed, and this method is described and claimed in my co-pending application, to which reference has been made above.
The following table is illustrative of the temperature-resistance' changes, of a 10-ohm coil of the 2.1 percent chromium alloy baked, at a temperature of 200 C. to bring its value to zero:
. The resistance of thiscoil was substantially independent of temperature throughout the entire I interval 20-30 C. With manganin a minimum variation of about 10 parts per million would have been expected in this entire temperature interval, which is nearly a hundred times that of the 2.1 percent chromium alloy. In testing 10-ohm and IOU-ohm coils the temperature resistance curves werefound to be substantially identical in each case. b
When manganin is used, in the construction of resistance standards, the coils are usually kept for a year or more in order to reach a reasonably stable state, but with my alloy this ageing is not necessary, and, obviously, is greatly preferable to the manganin. e
As will be evident to those skilled in the art, my invention permits of changes in percentages of elements in the alloy without departing from the spirit thereof or the scope of the appended claims,
What I claim is:
1. An electrical resistance element composed of an alloy comprised of gold and chromium, the chromium being in the'percentage of from one to five percent and the gold constituting the remainder of the element.
2. An alloy comprising 2.1" percent of chromium and the remainder gold.
3. An alloy'composed of gold and chromium, the chromium being in the percentage of from one to five per cent and the gold constituting the remainder.
' JAMES L. THOMAS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US50378A US2042972A (en) | 1934-11-22 | 1935-11-18 | Electrical resistance element and alloy therefor |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US754310A US2042971A (en) | 1934-11-22 | 1934-11-22 | Method of making electrical resistance elements and alloys therefor |
| US50378A US2042972A (en) | 1934-11-22 | 1935-11-18 | Electrical resistance element and alloy therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2042972A true US2042972A (en) | 1936-06-02 |
Family
ID=26728198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US50378A Expired - Lifetime US2042972A (en) | 1934-11-22 | 1935-11-18 | Electrical resistance element and alloy therefor |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2042972A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2579603A (en) * | 1949-02-18 | 1951-12-25 | Otto C Niederer | Article cleaning mechanism |
| US2840468A (en) * | 1958-02-04 | 1958-06-24 | Sigmund Cohn Corp | Novel gold alloys and potentiometer wires produced from them |
| US2949387A (en) * | 1953-12-31 | 1960-08-16 | Libbey Owens Ford Glass Co | Light transmissive electrically conducting article |
-
1935
- 1935-11-18 US US50378A patent/US2042972A/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2579603A (en) * | 1949-02-18 | 1951-12-25 | Otto C Niederer | Article cleaning mechanism |
| US2949387A (en) * | 1953-12-31 | 1960-08-16 | Libbey Owens Ford Glass Co | Light transmissive electrically conducting article |
| US2840468A (en) * | 1958-02-04 | 1958-06-24 | Sigmund Cohn Corp | Novel gold alloys and potentiometer wires produced from them |
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