GB157442A - Improvements in or relating to microphones and the like - Google Patents
Improvements in or relating to microphones and the likeInfo
- Publication number
- GB157442A GB157442A GB1371/21A GB137121A GB157442A GB 157442 A GB157442 A GB 157442A GB 1371/21 A GB1371/21 A GB 1371/21A GB 137121 A GB137121 A GB 137121A GB 157442 A GB157442 A GB 157442A
- Authority
- GB
- United Kingdom
- Prior art keywords
- funnel
- cathode
- battery
- resistance
- sound
- 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
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
- H04R23/004—Transducers other than those covered by groups H04R9/00 - H04R21/00 using ionised gas
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Resistance Heating (AREA)
- Joining Of Glass To Other Materials (AREA)
- Cosmetics (AREA)
- Reciprocating Pumps (AREA)
- Jet Pumps And Other Pumps (AREA)
Abstract
157,442. Vogt, H., Engl, J., and Massolle, J. Aug. 2, 1919, [Convention date]. Microphones and variableresistance transmitters. - Sound-waves passing across the ionized space between the end of the funnel t, which is connected to the positive plate of a battery b2, and an incandescent cathode k heated by a battery b1, cause the resistance of the intervening gap or gaseous discharge path to be correspondingly varied. The incandescent cathode is preferably coated with materials that facilitate ionization; or other special means such as R÷ntgen or Becquerel rays, or a high temperature may be employed in order to ionize the gap. In a modified form, the end of the funnel t carries a diaphragm on which is mounted an anode plate. As the diaphragm vibrates under the impact of the impressed sound-waves, the effective distance between the anode plate and the glowing cathode alters, thus setting up corresponding variations in the anode current. The resulting current-variations may be received or amplified by a telephone or coupling- resistance w.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE350500T | 1919-08-03 | ||
| US458632A US1534148A (en) | 1919-08-03 | 1921-04-04 | Sound-translating apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB157442A true GB157442A (en) | 1921-09-22 |
Family
ID=40404873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1371/21A Expired GB157442A (en) | 1919-08-03 | 1921-01-10 | Improvements in or relating to microphones and the like |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US1534148A (en) |
| DE (7) | DE351955C (en) |
| FR (1) | FR532175A (en) |
| GB (1) | GB157442A (en) |
| NL (1) | NL11725C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR910133A (en) * | 1945-01-10 | 1946-05-28 | Comptoir Des Cendres Et Metaux | thermionic emitter |
| US2669609A (en) * | 1948-10-30 | 1954-02-16 | Rca Corp | Electron discharge device |
| US2530745A (en) * | 1948-12-10 | 1950-11-21 | Bell Telephone Labor Inc | Transistor microphone with conductive grains |
| US2768246A (en) * | 1951-05-12 | 1956-10-23 | Charles Legorju | Electrical transducer |
| US3580075A (en) * | 1967-07-31 | 1971-05-25 | Corning Glass Works | Pressure transducer for ionizable fluids |
| US5401038A (en) * | 1993-08-26 | 1995-03-28 | David G. Peck | Mechanical brake for in-line roller skates |
| US5375859A (en) * | 1993-08-26 | 1994-12-27 | David G. Peck | Mechanical brake for in-line roller skate |
-
1916
- 1916-11-05 DE DE1916351955D patent/DE351955C/en not_active Expired
-
1919
- 1919-08-03 DE DE1919350500D patent/DE350500C/en not_active Expired
-
1920
- 1920-06-23 DE DEV15651D patent/DE368025C/en not_active Expired
- 1920-06-23 DE DE1920351956D patent/DE351956C/en not_active Expired
-
1921
- 1921-01-10 GB GB1371/21A patent/GB157442A/en not_active Expired
- 1921-03-15 FR FR532175D patent/FR532175A/en not_active Expired
- 1921-03-26 NL NL18704A patent/NL11725C/xx active
- 1921-04-04 US US458632A patent/US1534148A/en not_active Expired - Lifetime
- 1921-05-19 DE DEV16511D patent/DE366266C/en not_active Expired
- 1921-05-19 DE DEV16512D patent/DE368288C/en not_active Expired
-
1922
- 1922-08-26 DE DEV17711D patent/DE405857C/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL11725C (en) | 1924-10-15 |
| DE350500C (en) | 1922-03-22 |
| US1534148A (en) | 1925-04-21 |
| DE366266C (en) | 1923-01-03 |
| DE368025C (en) | 1923-01-29 |
| DE405857C (en) | 1924-11-12 |
| DE351956C (en) | 1922-04-19 |
| FR532175A (en) | 1922-01-30 |
| DE351955C (en) | 1922-04-19 |
| DE368288C (en) | 1923-02-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB449824A (en) | A process and various kinds of apparatus for the production of pictures by means of electric charges | |
| GB157442A (en) | Improvements in or relating to microphones and the like | |
| US2447377A (en) | Device for regulating electrical discharge | |
| GB746773A (en) | Improvements in electroacoustic devices | |
| GB851938A (en) | Improvements in and relating to electro-acoustical transducers | |
| GB529869A (en) | Improvements in telephone transmitters of the carbon granule type | |
| GB678695A (en) | Improvements in or relating to ionisation manometers | |
| GB780478A (en) | Improvements in or relating to electron discharge apparatus | |
| US1626645A (en) | Glow-discharge transmitter | |
| GB373270A (en) | Improvements in or relating to electric discharge lamps | |
| GB295751A (en) | Improvements in telephone transmitters | |
| GB264811A (en) | Improvements relating to electric sound-emitting devices or loud speakers | |
| GB482813A (en) | Improvements in or relating to gas-filled or vapour-filled electric discharge devices | |
| US1626648A (en) | Glow-discharge microphone | |
| GB313870A (en) | Improvements in condenser microphones | |
| GB749312A (en) | Improvements in or relating to indirectly heated cathodes for electron discharge devices | |
| GB290167A (en) | Improvements in or relating to carbon microphones | |
| JPS524775A (en) | Cathode-ray tube | |
| US1752811A (en) | Method and apparatus of telephonic communication | |
| US513720A (en) | Telephone | |
| US2242284A (en) | Mechanical amplifier | |
| GB257563A (en) | Improvements in or relating to appliances for persons with defective hearing | |
| GB594082A (en) | Improvements in or relating to microphones | |
| GB611414A (en) | Improvements in or relating to microphones | |
| GB228156A (en) | Improvements in apparatus for translating pressure variations into electrical variations |