GB496566A - Improvements in or relating to gas detectors - Google Patents

Improvements in or relating to gas detectors

Info

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
Application number
GB1508937A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB1508937A priority Critical patent/GB496566A/en
Publication of GB496566A publication Critical patent/GB496566A/en
Expired legal-status Critical Current

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.
GB1508937A 1937-05-31 1937-05-31 Improvements in or relating to gas detectors Expired GB496566A (en)

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)

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