GB396672A - Device for indicating the presence of a chemical substance by colour change - Google Patents

Device for indicating the presence of a chemical substance by colour change

Info

Publication number
GB396672A
GB396672A GB1545633A GB1545633A GB396672A GB 396672 A GB396672 A GB 396672A GB 1545633 A GB1545633 A GB 1545633A GB 1545633 A GB1545633 A GB 1545633A GB 396672 A GB396672 A GB 396672A
Authority
GB
United Kingdom
Prior art keywords
indicating
chemical substance
aperture
colour change
container
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
GB1545633A
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.)
COLBERT ERIC RICHARDS
FRANK OWEN BARRALET
Original Assignee
COLBERT ERIC RICHARDS
FRANK OWEN BARRALET
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 COLBERT ERIC RICHARDS, FRANK OWEN BARRALET filed Critical COLBERT ERIC RICHARDS
Priority to GB1545633A priority Critical patent/GB396672A/en
Publication of GB396672A publication Critical patent/GB396672A/en
Priority to FR773490D priority patent/FR773490A/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
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/29—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using visual detection
    • G01N21/293—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using visual detection with colour charts, graduated scales or turrets

Abstract

<PICT:0396672/III/1> <PICT:0396672/III/2> A device for testing gases comprises a container for test paper or the like having an aperture exposing a portion of the test material, the container adjacent to the aperture bearing a colour or range of colours with which the test material is compared. The preferred embodiment comprises a circular container 1 in which a disc of test paper 3 is supported on resilient material 2 and provided with a cover 4 having an aperture 5 and two coloured portions 6, 7. Successive portions of test paper can be exposed by rotating the cover.
GB1545633A 1933-05-29 1933-05-29 Device for indicating the presence of a chemical substance by colour change Expired GB396672A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1545633A GB396672A (en) 1933-05-29 1933-05-29 Device for indicating the presence of a chemical substance by colour change
FR773490D FR773490A (en) 1933-05-29 1934-05-22 Device improvements to indicate the presence of chemical substances by color change

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1545633A GB396672A (en) 1933-05-29 1933-05-29 Device for indicating the presence of a chemical substance by colour change

Publications (1)

Publication Number Publication Date
GB396672A true GB396672A (en) 1933-08-10

Family

ID=10059452

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1545633A Expired GB396672A (en) 1933-05-29 1933-05-29 Device for indicating the presence of a chemical substance by colour change

Country Status (2)

Country Link
FR (1) FR773490A (en)
GB (1) GB396672A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2602729A (en) * 1941-10-30 1952-07-08 Curry Manfred Apparatus for determining the concentration of a chemically active gas in an atmosphere
US2738257A (en) * 1954-06-14 1956-03-13 William K Darby Composition, method, and device for detecting carbon monoxide
US2941870A (en) * 1955-12-09 1960-06-21 Mine Safety Appliances Co Solvent extraction device
GB2182458A (en) * 1985-09-18 1987-05-13 Sarah Crutch Comparing visible information from a sample to a reference

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2602729A (en) * 1941-10-30 1952-07-08 Curry Manfred Apparatus for determining the concentration of a chemically active gas in an atmosphere
US2738257A (en) * 1954-06-14 1956-03-13 William K Darby Composition, method, and device for detecting carbon monoxide
US2941870A (en) * 1955-12-09 1960-06-21 Mine Safety Appliances Co Solvent extraction device
GB2182458A (en) * 1985-09-18 1987-05-13 Sarah Crutch Comparing visible information from a sample to a reference

Also Published As

Publication number Publication date
FR773490A (en) 1934-11-19

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