GB235746A - - Google Patents
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- Publication number
- GB235746A GB235746A GB235746DA GB235746A GB 235746 A GB235746 A GB 235746A GB 235746D A GB235746D A GB 235746DA GB 235746 A GB235746 A GB 235746A
- Authority
- GB
- United Kingdom
- Prior art keywords
- couple
- compensating
- main
- wire
- couples
- 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.)
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- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
235,746. Good, W. B. Aug. 12, 1924. Thermal current meters; temperature errors, compensating for.-The main current terminals a, b of a thermal ammeter are connected by a heating strip or wire c to which is thermally connected the hot junction d of the main thermoelectric couple d<1>, d<2>, the connection preferably being made through a short length of wire c<1>, serving only as a heat conductor. ' The cold ends d<3>, d<4> of this couple are each connected to the galvanometer e by means of subsidiary or compensating thermo-electric couples f<1>, f<2> and g<1>, g<2>. The hot junction f<3> of the couple f<1>, f<2> is connected to a compensating-plate h which is thermally connected to the terminal b but electrically insulated therefrom, as by a sheet of mica i. Similarly, the hot junction g<3> of the couple g<1>, g<2> is connected to a plate j which is thermally connected to but electrically insulated from the terminal a. The wire d<1> may be iron and the wire d<2> eureka, the wires g<1>, f<2> being of copper and the wires f<1>, g<2> of constantan. The ptates h, j may be of copper or other metal. The same materials may be used in the compensating couples as in the main couple, provided they are arranged to produce a reverse current from that due to the main couple.. The current generated by the compensating couples is equal to that generated by the main couple after the main circuit current is broken, thus bringing the indicating needle rapidly to zero. The indicatoris calibrated to allow for the reverse current generated in the compensating couples.
Publications (1)
Publication Number | Publication Date |
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GB235746A true GB235746A (en) |
Family
ID=1737758
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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GB235746D Active GB235746A (en) |
Country Status (1)
Country | Link |
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GB (1) | GB235746A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3477880A (en) * | 1965-02-26 | 1969-11-11 | Cossor Ltd A C | Thermo-couple device for current measurement |
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- GB GB235746D patent/GB235746A/en active Active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3477880A (en) * | 1965-02-26 | 1969-11-11 | Cossor Ltd A C | Thermo-couple device for current measurement |
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