US329030A - Thomas a - Google Patents
Thomas a Download PDFInfo
- Publication number
- US329030A US329030A US329030DA US329030A US 329030 A US329030 A US 329030A US 329030D A US329030D A US 329030DA US 329030 A US329030 A US 329030A
- Authority
- US
- United States
- Prior art keywords
- telephone
- thomas
- granules
- carbon
- circuit
- 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 - Lifetime
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 14
- 229910052799 carbon Inorganic materials 0.000 description 14
- 239000008187 granular material Substances 0.000 description 14
- 230000001070 adhesive Effects 0.000 description 8
- 239000000853 adhesive Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 210000000188 Diaphragm Anatomy 0.000 description 4
- 239000004020 conductor Substances 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
Images
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
Definitions
- A is a metal diaphragm, between which and a metal back plate, B, is located a body, 0, of loose granules of carbon or other conducting material. These granules are coated with an adhesive substance, as already explained.
- the circuit-connections l 2 are made with the dia phragm and back plate, the body of granulated carbon or other material being interpolated in the circuit between those parts.
- a telephone having in circuit a body of granulated material, the granules being coated with an adhesive substance, substantially as set forth.
- a telephone having in circuit a body of granulated carbon, the carbon granules being coated with an adhesive substance, substantially as set forth.
Description
(No Model.)
AVEDISON.
TELEPHONE. No. 329,030. Patented 001:. 27, 1885.
= INVENTOR- UQ/A/JO N. PEYERS. Phnln-Lilhngmpher, Wuhiqgtnn, m;
UNITED STATES PATENT OFFICE.
THOMAS A. EDISON, OF MENLO PARK, NEW JERSEY.
TELEPHONE.
SPECIFICATION forming part of Letters Patent No. 329,030, dated October 27, 1885 Application filed December 15, 1884. Serial No. 150,344. (No model.)
To all whom it may concern:
Be it known that I, THOMAS A. Enrson, of Menlo Park, in the county of Middlesex and State of New Jersey, have invented a new and useful Improvement in Telephones, (Case No. 636,) of which the following is a specification.
In the use of loose granulated carbon or other divided conducting material in telephones such material is liable to shift its position and become packed, and theinstrument be thereby made to fail in its operation. This renders it necessary to fix the position of such instruments, which is not desirable, and eyen when their position is fixed the difficulty is not wholly overcome, since external vibrations serve to produce thesame result. I have found, however, that by coating to the minimum extent the carbon or other granules with an adhesive substancesuch as an oil or other viscous material-the effectiveness of the instrument is not injured, and the granules will retain their relative positions without packing. This discovery is applicable to any form of telephone in which granulated carbon or other material is used, and hence Iwish it understood that my invention is not limited to any particular construction of instrument.
In the accompanying drawing, to which reference is now made, there is shown, for illus- .tration, a sectional view of a conventional form of telephone.
Ais a metal diaphragm, between which and a metal back plate, B, is located a body, 0, of loose granules of carbon or other conducting material. These granules are coated with an adhesive substance, as already explained. The circuit-connections l 2 are made with the dia phragm and back plate, the body of granulated carbon or other material being interpolated in the circuit between those parts.
What I claim is 1. A telephone having in circuit a body of granulated material, the granules being coated with an adhesive substance, substantially as set forth.
2. A telephone having in circuit a body of granulated carbon, the carbon granules being coated with an adhesive substance, substantially as set forth.
This specification signed and witnessed this 3d day of December, 1884.
THOMAS A. EDISON.
Witnesses:
THOS. G. GREENE, J r., EDW. O. ROWLAND.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US329030A true US329030A (en) | 1885-10-27 |
Family
ID=2398140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US329030D Expired - Lifetime US329030A (en) | Thomas a |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US329030A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2417850A (en) * | 1942-04-14 | 1947-03-25 | Willis M Winslow | Method and means for translating electrical impulses into mechanical force |
| US20020179131A1 (en) * | 2001-06-01 | 2002-12-05 | The Regents Of The University Of Minnesota | Tray apparatus and methods regarding same |
-
0
- US US329030D patent/US329030A/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2417850A (en) * | 1942-04-14 | 1947-03-25 | Willis M Winslow | Method and means for translating electrical impulses into mechanical force |
| US20020179131A1 (en) * | 2001-06-01 | 2002-12-05 | The Regents Of The University Of Minnesota | Tray apparatus and methods regarding same |
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