GB399978A - An improved electric gas-detecting lamp - Google Patents

An improved electric gas-detecting lamp

Info

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
Application number
GB2673332A
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 GB2673332A priority Critical patent/GB399978A/en
Publication of GB399978A publication Critical patent/GB399978A/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)
  • 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.
GB2673332A 1932-09-27 1932-09-27 An improved electric gas-detecting lamp Expired GB399978A (en)

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)

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