GB193958A - Improvements in signalling apparatus for mines and the like - Google Patents
Improvements in signalling apparatus for mines and the likeInfo
- Publication number
- GB193958A GB193958A GB3217321A GB3217321A GB193958A GB 193958 A GB193958 A GB 193958A GB 3217321 A GB3217321 A GB 3217321A GB 3217321 A GB3217321 A GB 3217321A GB 193958 A GB193958 A GB 193958A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- valve
- filament
- wire
- bell
- 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
- 230000011664 signaling Effects 0.000 title abstract 2
- 230000001939 inductive effect Effects 0.000 abstract 1
- 230000000007 visual effect Effects 0.000 abstract 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
193,958. Harvey, G. M. Dec. 1, 1921. Thermionic valve circuits.-In order to get rid of self-induction in signalling circuits for mines and collieries and so reduce sparking, a thermionic valve A is used as a non-inductive relay. Two bare wires G are led throughout the portion of the mine from which signals are to be received and one of them is connected at the receiving station to a battery E the other pole of which is connected through the filament B of a thermionic valve to the far end of the other bare wire by means of a third wire K. The anode and grid of the valve are connected to the battery through the coils L of a relay. When the bare wires G are brought into contact, the filament glows and a current sufficient to operate the relay flows through the valve. A bell O is operated by the relay and the glowing of the filament also acts as a visual signal. The filaments of valves at other receiving stations may be in circuit with the wire K. and the valve, relay, and bell at each station may be enclosed in explosion-proof cases. Specifications 151,118, [Class 40 (iv), Telephones &c.], and 168,394 are referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3217321A GB193958A (en) | 1921-12-01 | 1921-12-01 | Improvements in signalling apparatus for mines and the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3217321A GB193958A (en) | 1921-12-01 | 1921-12-01 | Improvements in signalling apparatus for mines and the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB193958A true GB193958A (en) | 1923-03-01 |
Family
ID=10334438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3217321A Expired GB193958A (en) | 1921-12-01 | 1921-12-01 | Improvements in signalling apparatus for mines and the like |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB193958A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106685630A (en) * | 2016-12-09 | 2017-05-17 | 中国石油集团西部钻探工程有限公司 | Underground bidirectional communication device |
-
1921
- 1921-12-01 GB GB3217321A patent/GB193958A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106685630A (en) * | 2016-12-09 | 2017-05-17 | 中国石油集团西部钻探工程有限公司 | Underground bidirectional communication device |
| CN106685630B (en) * | 2016-12-09 | 2023-07-07 | 中国石油天然气集团有限公司 | Underground two-way communication device |
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