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 changeInfo
- 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
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
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
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.
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)
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 |
-
1933
- 1933-05-29 GB GB1545633A patent/GB396672A/en not_active Expired
-
1934
- 1934-05-22 FR FR773490D patent/FR773490A/en not_active Expired
Cited By (4)
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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