GB496566A - Improvements in or relating to gas detectors - Google Patents
Improvements in or relating to gas detectorsInfo
- Publication number
- GB496566A GB496566A GB1508937A GB1508937A GB496566A GB 496566 A GB496566 A GB 496566A GB 1508937 A GB1508937 A GB 1508937A GB 1508937 A GB1508937 A GB 1508937A GB 496566 A GB496566 A GB 496566A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lamp
- pict
- filaments
- limb
- iii
- 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
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/71—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light thermally excited
- G01N21/716—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light thermally excited by measuring the radiation emitted by a test object treated by combustion gases for investigating the composition of gas mixtures
Landscapes
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Combustion & Propulsion (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
<PICT:0496566/III/1> <PICT:0496566/III/2> A gas-detector comprising an electrically heated surface E on which inflammable gas burns and means for indicating the resulting rise in temperature includes a time switch H which switches on the electric heating intermittently for comparatively short periods. The device may be embodied in a miner's electric lamp and the indication given by extinguishing the lamp C. This may be effected by inserting in the lamp circuit an L-shaped bi-metallic strip M, one limb of which is exposed to the heat produced on the test surface E, while the other limb compensates for changes in atmospheric temperature. The concentration of inflammable gas may be estimated by comparing the illumination of the filament E with that of a lamp F which is calibrated by means of a resistance K, the two filaments being mounted on opposite sides of an opaque partition and viewed through opal glass. For this purpose the filaments may be illuminated independently of the time switch by means of a switch H1. The testing device is separated from the atmosphere by double gauzes G, G1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1508937A GB496566A (en) | 1937-05-31 | 1937-05-31 | Improvements in or relating to gas detectors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1508937A GB496566A (en) | 1937-05-31 | 1937-05-31 | Improvements in or relating to gas detectors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB496566A true GB496566A (en) | 1938-11-30 |
Family
ID=10052827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1508937A Expired GB496566A (en) | 1937-05-31 | 1937-05-31 | Improvements in or relating to gas detectors |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB496566A (en) |
-
1937
- 1937-05-31 GB GB1508937A patent/GB496566A/en not_active Expired
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