GB399978A - An improved electric gas-detecting lamp - Google Patents
An improved electric gas-detecting lampInfo
- Publication number
- GB399978A GB399978A GB2673332A GB2673332A GB399978A GB 399978 A GB399978 A GB 399978A GB 2673332 A GB2673332 A GB 2673332A GB 2673332 A GB2673332 A GB 2673332A GB 399978 A GB399978 A GB 399978A
- Authority
- GB
- United Kingdom
- Prior art keywords
- screen
- filaments
- lamp
- pict
- partition
- 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)
- Fire-Detection Mechanisms (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
<PICT:0399978/III/1> <PICT:0399978/III/2> In fire-damp &c. detectors of the kind comprising two electrically heated filaments of which one is sealed and the other exposed to the atmosphere, the two filaments are arranged so that they illuminate respectively adjacent portions of a screen of opal glass or the like. Quantitative estimations can be made by observing one-half of the screen through a viewing screen having sectors of varying depth of neutral tint. The device is preferably incorporated in a miner's lamp of the usual type, a switch being provided to place either the lighting bulb or the detecting device in circuit. Figs. 7, 8 illustrate such a lamp in which the lighting bulb A occupies one sector of the casing while the other two sectors contain the sealed and exposed filaments D, C respectively. Perforations B<8> and gauze B<9> permit the access of the atmosphere. The opal glass screen E is bisected by the partition B<7>. An adjustable reflector K serves to calibrate the instrument. In another modification the partition B<7> has two concave surfaces which reflect the light of the filaments on to the screen. In a third modification the filaments are contained in a vertically divided cylinder which takes the place of one of the usual pillars supporting the top of the lamp. The screen constitutes the upper end of this cylinder.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2673332A GB399978A (en) | 1932-09-27 | 1932-09-27 | An improved electric gas-detecting lamp |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2673332A GB399978A (en) | 1932-09-27 | 1932-09-27 | An improved electric gas-detecting lamp |
Publications (1)
Publication Number | Publication Date |
---|---|
GB399978A true GB399978A (en) | 1933-10-19 |
Family
ID=10248373
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2673332A Expired GB399978A (en) | 1932-09-27 | 1932-09-27 | An improved electric gas-detecting lamp |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB399978A (en) |
-
1932
- 1932-09-27 GB GB2673332A patent/GB399978A/en not_active Expired
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