GB186333A - Improvements in telephone systems - Google Patents
Improvements in telephone systemsInfo
- Publication number
- GB186333A GB186333A GB25042/22A GB2504222A GB186333A GB 186333 A GB186333 A GB 186333A GB 25042/22 A GB25042/22 A GB 25042/22A GB 2504222 A GB2504222 A GB 2504222A GB 186333 A GB186333 A GB 186333A
- Authority
- GB
- United Kingdom
- Prior art keywords
- current
- source
- interrupter
- transformer
- modulated
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
Abstract
186,333. Western Electric Co., Ltd., (Assignees of Beach, W. C.) Sept. 20, 1921, [Convention date]. Exchange systems.-The calling subscriber is notified that the called subscriber is being signalled by means of a modulated current from the same source, giving a tone similar to that from a separate source. The current from the source 1, modulated by an interrupter 4. is applied to the primary winding of a transformer 4, and the induced current, filtered by means of coils 27 and condensers 28, is applied to the calling line. The primary circuit is adjusted by means of a condenser 32 in shunt with the interrupter 4 and transformer 5
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US501974A US1519477A (en) | 1921-09-20 | 1921-09-20 | Signaling system |
Publications (1)
Publication Number | Publication Date |
---|---|
GB186333A true GB186333A (en) | 1923-07-26 |
Family
ID=23995781
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB25042/22A Expired GB186333A (en) | 1921-09-20 | 1922-09-15 | Improvements in telephone systems |
Country Status (3)
Country | Link |
---|---|
US (1) | US1519477A (en) |
FR (1) | FR556237A (en) |
GB (1) | GB186333A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2791972A (en) * | 1951-10-15 | 1957-05-14 | Gilbert Co A C | Vibrator excited loud speaker for toys |
-
1921
- 1921-09-20 US US501974A patent/US1519477A/en not_active Expired - Lifetime
-
1922
- 1922-09-15 GB GB25042/22A patent/GB186333A/en not_active Expired
- 1922-09-18 FR FR556237D patent/FR556237A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US1519477A (en) | 1924-12-16 |
FR556237A (en) | 1923-07-13 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB186333A (en) | Improvements in telephone systems | |
US2375791A (en) | Telephone station circuit | |
GB430651A (en) | Improvements in apparatus for converting electric current into polyphase | |
US1864645A (en) | Telephone signaling system | |
SU1616A1 (en) | Telephone translation of one-way reverse action | |
US1484396A (en) | Telephone system | |
US1621557A (en) | Combined resonant shunt device for telegraph circuits | |
US1654929A (en) | Amplifier circuits | |
US2234213A (en) | Tone signal source for telephone signaling systems | |
SU30318A1 (en) | A device for simultaneous transmission of the same program by radio and by wire | |
US1512933A (en) | Signaling system | |
AT145364B (en) | Circuit arrangement for subscriber stations in telephone systems with dialer operation. | |
GB182244A (en) | Improvements in telephone repeaters | |
GB158141A (en) | Improvements in or relating to telephone systems | |
US2134690A (en) | Electrical communication network | |
US1689598A (en) | Telephone substation circuits | |
US1624057A (en) | Telephone substation circuits | |
SU748A1 (en) | Telephone set with central battery | |
SU70222A1 (en) | Device for switching subscriber lines in control room switches | |
SU747A1 (en) | Differential telephone with local battery | |
SU12259A1 (en) | Switch for intermediate long distance telephone exchanges with simultaneous telephoning and cabling using Picard system | |
GB441717A (en) | Improvements in or relating to methods of direct-current braking for three-phase motors | |
SU324A1 (en) | A telephone that responds only to incoming currents | |
SU429554A1 (en) | TELEPHONE APPARATUS | |
GB530621A (en) | Improvements in or relating to superimposed telegraph and telephone systems |