DE89558C - - Google Patents
Info
- Publication number
- DE89558C DE89558C DENDAT89558D DE89558DA DE89558C DE 89558 C DE89558 C DE 89558C DE NDAT89558 D DENDAT89558 D DE NDAT89558D DE 89558D A DE89558D A DE 89558DA DE 89558 C DE89558 C DE 89558C
- Authority
- DE
- Germany
- Prior art keywords
- electrode
- record
- membrane
- packing
- section
- 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.)
- Active
Links
- 238000012856 packing Methods 0.000 claims description 4
- 239000003245 coal Substances 0.000 claims description 3
- 239000008187 granular material Substances 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims 1
- 239000012528 membrane Substances 0.000 description 5
- 229910001369 Brass Inorganic materials 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Inorganic materials [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 1
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000011507 gypsum plaster Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R21/00—Variable-resistance transducers
- H04R21/02—Microphones
- H04R21/021—Microphones with granular resistance material
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE89558C true DE89558C (cs) |
Family
ID=361365
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT89558D Active DE89558C (cs) |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE89558C (cs) |
-
0
- DE DENDAT89558D patent/DE89558C/de active Active
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