GB191305568A - Improvements in Gas Detecting Apparatus for Portable Electric Hand Lamps. - Google Patents
Improvements in Gas Detecting Apparatus for Portable Electric Hand Lamps.Info
- Publication number
- GB191305568A GB191305568A GB191305568DA GB191305568A GB 191305568 A GB191305568 A GB 191305568A GB 191305568D A GB191305568D A GB 191305568DA GB 191305568 A GB191305568 A GB 191305568A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wire
- resistance
- slide
- lamp
- electric hand
- 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
- 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
- G01N27/16—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 burning or catalytic oxidation of surrounding material to be tested, e.g. of gas
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 By The Use Of Electric Means (AREA)
Abstract
5568. Ralph, G. J. March 6. Explosive gases, detecting.-A device suitable for attaching to an electric hand lamp for indicating the presence of fire-damp &c. comprises a wire of catalytic material arranged in series with a second conductor to form two arms of a wheatstone bridge the other two arms consisting of two resistances connected by a low-resistance slide wire. In the form shown, current from a battery A may be supplied to a lamp B through a switch C or to the bridge D, E, F, G through a switch P, which is preferably a spring contact closed only while pressure is applied. The wires D, E are preferably normally of equal resistance and are in parallel with relatively high resistances F, G connected by a low-resistance wire H, which is engaged by a contact slide K and is preferably arranged around a circular block of wood &c. In the presence of gas, the resistance of the wire D increases, and the amount of gas present is indicated by the adjustment of the slide K that is required to bring the galvano eter needle J back to zero. The resistance H and slide K may be placed in a flame-tight box M attached to the galvanometer. According to the Provisional Specification, a lamp may replace the wire E.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB191305568T | 1913-03-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB191305568A true GB191305568A (en) | 1914-05-06 |
Family
ID=32578094
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB191305568D Expired GB191305568A (en) | 1913-03-06 | 1913-03-06 | Improvements in Gas Detecting Apparatus for Portable Electric Hand Lamps. |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB191305568A (en) |
-
1913
- 1913-03-06 GB GB191305568D patent/GB191305568A/en not_active Expired
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