GB156524A - Improvements in and relating to gas indicators - Google Patents

Improvements in and relating to gas indicators

Info

Publication number
GB156524A
GB156524A GB434/21A GB43421A GB156524A GB 156524 A GB156524 A GB 156524A GB 434/21 A GB434/21 A GB 434/21A GB 43421 A GB43421 A GB 43421A GB 156524 A GB156524 A GB 156524A
Authority
GB
United Kingdom
Prior art keywords
branches
coefficient
gases
coils
metal
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
GB434/21A
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
Publication of GB156524A publication Critical patent/GB156524A/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
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/14—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature
    • G01N27/18—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature caused by changes in the thermal conductivity of a surrounding material to be tested
    • G01N27/185—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature caused by changes in the thermal conductivity of a surrounding material to be tested using a catharometer

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

156,524. Heinicke, H. Jan. 17, 1916, [Convention date]. Explosive gases, detecting.-In apparatus for detecting explosive gases wherein two heated wires 1, 2 of small section and with a high temperature-coefficient are arranged in opposite branches of a Wheatstone bridge and indicate the nature of the surrounding gases by changes of resistance due to the conductivitv of heat of the gases, the third and fourth branches of the bridge are so arranged as to have approximately the same temperature-coefficient as the first-named branches so as to eliminate the effects of external temperature variations. The third and fourth branches may comprise coils 4, 6 of metal having a low temperature-coefficient and coils 3, 5 of metal having a high temperature-coefficent: the coils 3, 5 and wires 1, 2 may be of the same metal. The current is regulated by a resistance 15 and voltmeter 16 and the induction is given by either of two scales on a galvanometer 25 according to the position of a cross-over switch 17 which puts a resistance 24 in or out of circuit.
GB434/21A 1916-01-17 1921-01-05 Improvements in and relating to gas indicators Expired GB156524A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE156524X 1916-01-17

Publications (1)

Publication Number Publication Date
GB156524A true GB156524A (en) 1922-04-05

Family

ID=5677877

Family Applications (1)

Application Number Title Priority Date Filing Date
GB434/21A Expired GB156524A (en) 1916-01-17 1921-01-05 Improvements in and relating to gas indicators

Country Status (2)

Country Link
DE (1) DE304796C (en)
GB (1) GB156524A (en)

Also Published As

Publication number Publication date
DE304796C (en)

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