GB587307A - Improvements in or relating to hygrometers - Google Patents
Improvements in or relating to hygrometersInfo
- Publication number
- GB587307A GB587307A GB2895045A GB2895045A GB587307A GB 587307 A GB587307 A GB 587307A GB 2895045 A GB2895045 A GB 2895045A GB 2895045 A GB2895045 A GB 2895045A GB 587307 A GB587307 A GB 587307A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wet
- junctions
- heat
- galvanometer
- junction
- 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
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/56—Investigating or analyzing materials by the use of thermal means by investigating moisture content
- G01N25/62—Investigating or analyzing materials by the use of thermal means by investigating moisture content by psychrometric means, e.g. wet-and-dry bulb thermometers
- G01N25/64—Investigating or analyzing materials by the use of thermal means by investigating moisture content by psychrometric means, e.g. wet-and-dry bulb thermometers using electric temperature-responsive elements
Landscapes
- Physics & Mathematics (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 Materials Using Thermal Means (AREA)
Abstract
587,307. Hygrometers. NEGRETTI, H. N., NEGRETTI, P. E., and GREGORY, H. SPENCER-. Oct. 31, 1945, No. 28950. [Class 97 (iii)] In a hygrometer using wet and dry thermometers, heat is supplied to the heat-sensitive part of the wet thermometer to compensate for the heat lost due to evaporation, the heat supplied being measured to determine the humidity of the air. In the embodiment shown in Fig. 2, a dry thermo-junction 5 and a wet thermo-junction 6 in circuit with a galvanometer 21 and arranged to give a null reading thereon when the junctions are at the same temperature, are located in a duct 11 through which air is drawn by a fan. The wet junction 6 is heated by a coil 10 connected in series with an ammeter 18 and regulating resistance 17 to regulate the heating current until the galvanometer 21 gives a zero reading. More than two junctions may be used in series with the galvanometer 21 as shown in Fig. 3 and arranged alternately as wet and dry junctions. A heating wire 9 is wound round all the wet junctions in turn and is in series with an ammeter and regulating resistance as in Fig. 2. The junctions are mounted on an insulating frame 22 which can be rocked intermittently to dip the wet junctions 6 into trough 24 of water. This latter may be fitted with a lid that can be automatically removed and replaced as frame 22 rocks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2895045A GB587307A (en) | 1945-10-31 | 1945-10-31 | Improvements in or relating to hygrometers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2895045A GB587307A (en) | 1945-10-31 | 1945-10-31 | Improvements in or relating to hygrometers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB587307A true GB587307A (en) | 1947-04-21 |
Family
ID=10283812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2895045A Expired GB587307A (en) | 1945-10-31 | 1945-10-31 | Improvements in or relating to hygrometers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB587307A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4887466A (en) * | 1987-09-23 | 1989-12-19 | Gil Avery | Wet bulb sensor system |
-
1945
- 1945-10-31 GB GB2895045A patent/GB587307A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4887466A (en) * | 1987-09-23 | 1989-12-19 | Gil Avery | Wet bulb sensor system |
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