GB400275A - Improvements in or relating to photophones - Google Patents
Improvements in or relating to photophonesInfo
- Publication number
- GB400275A GB400275A GB11733/32A GB1173332A GB400275A GB 400275 A GB400275 A GB 400275A GB 11733/32 A GB11733/32 A GB 11733/32A GB 1173332 A GB1173332 A GB 1173332A GB 400275 A GB400275 A GB 400275A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lamp
- light
- receiver
- sighting
- diaphragm
- 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
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 abstract 2
- 229910052754 neon Inorganic materials 0.000 abstract 2
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 abstract 2
- 229910052708 sodium Inorganic materials 0.000 abstract 2
- 239000011734 sodium Substances 0.000 abstract 2
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Spectrometry And Color Measurement (AREA)
Abstract
400,275. Photophones. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., Marconi House, Strand, London, WRIGHT, G. M., Burford, Great Baddow, Chelmsford, and BRETT, G. F., 23, Cross Flatts Avenue, Dewsbury Road, Leeds. April 23, 1932, No. 11733. [Class 40 (v).] A photophone uses approximately monochromatic light. A neon-filled glow-discharge lamp T is used with sodium in the envelope and associated with a heater which keeps the lamp at such a temperature that the light emitted corresponds to the sodium D lines. When the heater is not used the light is ordinary neon red. The light is directed to the receiver by a parabolic mirror adjusted by a sighting-device. The lamp is in the output circuit of a valve 6, to the grid 8 of which the signals are applied. The valve is shunted by a resistance 7. According to a modification, the lamp is connected across the anode battery 4, Fig. 3 (not shown). At the receiver the monochromatic light is separated by a filter, Fig. 4. (not shown), or by a prism P behind a diaphragm D1 and in front of a diaphragm D2 which is adjusted to select the desired colour. The receiver is directed towards the transmitter by a sighting- device.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB11733/32A GB400275A (en) | 1932-04-23 | 1932-04-23 | Improvements in or relating to photophones |
| US667476A US2031198A (en) | 1932-04-23 | 1933-04-22 | Photophone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB11733/32A GB400275A (en) | 1932-04-23 | 1932-04-23 | Improvements in or relating to photophones |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB400275A true GB400275A (en) | 1933-10-23 |
Family
ID=9991672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB11733/32A Expired GB400275A (en) | 1932-04-23 | 1932-04-23 | Improvements in or relating to photophones |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2031198A (en) |
| GB (1) | GB400275A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2562887A (en) * | 1945-01-04 | 1951-08-07 | Westinghouse Electric Corp | Vapor lamp and system |
| US2970310A (en) * | 1947-09-23 | 1961-01-31 | Bell Telephone Labor Inc | Light pulse generator |
| FR1485625A (en) * | 1966-04-14 | 1967-06-23 | Csf | New monochromatic light source of constant intensity |
-
1932
- 1932-04-23 GB GB11733/32A patent/GB400275A/en not_active Expired
-
1933
- 1933-04-22 US US667476A patent/US2031198A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US2031198A (en) | 1936-02-18 |
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