US355149A - Amos emeeson dolbeae - Google Patents
Amos emeeson dolbeae Download PDFInfo
- Publication number
- US355149A US355149A US355149DA US355149A US 355149 A US355149 A US 355149A US 355149D A US355149D A US 355149DA US 355149 A US355149 A US 355149A
- Authority
- US
- United States
- Prior art keywords
- amos
- emeeson
- dolbeae
- electrified
- plate
- 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
- 210000000188 Diaphragm Anatomy 0.000 description 12
- 239000002184 metal Substances 0.000 description 10
- 229910052751 metal Inorganic materials 0.000 description 10
- 239000003795 chemical substances by application Substances 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229920001875 Ebonite Polymers 0.000 description 2
- 241000277303 Electrophorus Species 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000126 substance Substances 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
- H04R19/00—Electrostatic transducers
- H04R19/02—Loudspeakers
Definitions
- the diaphragm in my receiver is a plate of sheet 25 metal, its electrification is of course only that of the electrifying agent, the former varying instantly as the latter varies, and the plate is not electrified except when the agent is acting.
- A represents the hardrubber casing, and a the plates of metal, each coated on both sides with an electrified dielee 50 trio, as illustrated in Fig. 2, where a represents the metal portion of the plate, and a the electrified coating.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Description
(No Model.)
. A. E. DOLBEAR.
TELEPHONE REG'EIVER,' No. 355,149. Patented Dec. 28, 1886.
UNITED V STATES PATENT OFFICE.
AMOS EMERSON DOLBEAR, OF SOMERVILLE, MASSACHUSETTS, ASSIGNOR, BY
MESN E ASSIGNMENTS, TO THE DOLBEAR ELECTRIC TELEPHONE COM- IANY, OF NEW JERSEY.
TELEPHONE-RECEIVER.
SPECIFICATION forming part of Letters Patent No. 355,149, dated December 28, 1886.
Application filed February 15, 1882. Serial No. 52,766. (No modelll I To all whom it may concern: I
Be it known that I, AMos EMERSON DoL- BEAR, of Somerville, in the county of MiddleseX and State of Massachusetts, have invented 5 an Improvement in Telephone-Receivers, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, in which Figure 1 is a cross-section of one of my I111- IO provedreceivers. Fig.2isasection, enlarged,
of one of its diaphragms.
a In my Patents No. 239,742, dated April 5, 1881, and No. 240,578, dated April 26, 1881, I havedescribed a receiver of my invention, I 5 and my present invention relates to that class of instruments; and it consists in using, in
place of an uncovered metal diaphragm, adiaphragm coated on one or both sides with a dielectric substance which is eleotrified, thepur- 2o pose being to cause a permanent electrification of the diaphragm, as distinguished from the varying electrification by means of which the diaphragm is caused to vibrate. lVhen the diaphragm in my receiver is a plate of sheet 25 metal, its electrification is of course only that of the electrifying agent, the former varying instantly as the latter varies, and the plate is not electrified except when the agent is acting. I have found it of considerable benefit 0 to keep the plate electrified while the electrifying agent is not acting, and the best means known to me for effecting this is to make the plates of metal coated with resinous or other dielectriematter capable of holding a charge of electricity for some length of time. When 5 both plates are connected with the coil or other source of charge, both will become charged by use, and will remain appreciably charged for days without use, if the plates be made of the well-known ferrotype iron, which 0 is coated on both sides with a compound applied in a way too well known to need description. In that form of my instrument where only one plate is connected with the source ofcharge the other plate should be 5 electrified from an electrophorus, or in some other convenient way.
In the drawings, A represents the hardrubber casing, and a the plates of metal, each coated on both sides with an electrified dielee 50 trio, as illustrated in Fig. 2, where a represents the metal portion of the plate, and a the electrified coating.
What I claim as my invention is In a receiver of the kind above described, 55 actuated by variations of potential, the electrified dielectric coating a, in combination with the diaphragm a, as and for the purpose specified.
AMOS EMERSON DOLBEAR.
XVitnesscs:
G. B. MAYNADIRR, J our: R; Snow.
Publications (1)
Publication Number | Publication Date |
---|---|
US355149A true US355149A (en) | 1886-12-28 |
Family
ID=2424197
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US355149D Expired - Lifetime US355149A (en) | Amos emeeson dolbeae |
Country Status (1)
Country | Link |
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US (1) | US355149A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2624853A (en) * | 1948-12-28 | 1953-01-06 | Brush Dev Co | Flexure-sensitive electromechanical transducer device |
US2659829A (en) * | 1948-12-28 | 1953-11-17 | Clevite Corp | Transducer device electromechanically sensitive to flexure |
US3590169A (en) * | 1968-04-01 | 1971-06-29 | Tesla Np | Electrostatic horn loudspeaker |
-
0
- US US355149D patent/US355149A/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2624853A (en) * | 1948-12-28 | 1953-01-06 | Brush Dev Co | Flexure-sensitive electromechanical transducer device |
US2659829A (en) * | 1948-12-28 | 1953-11-17 | Clevite Corp | Transducer device electromechanically sensitive to flexure |
US3590169A (en) * | 1968-04-01 | 1971-06-29 | Tesla Np | Electrostatic horn loudspeaker |
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