US217561A - Improvement in speaking-telephones - Google Patents
Improvement in speaking-telephones Download PDFInfo
- Publication number
- US217561A US217561A US217561DA US217561A US 217561 A US217561 A US 217561A US 217561D A US217561D A US 217561DA US 217561 A US217561 A US 217561A
- Authority
- US
- United States
- Prior art keywords
- carbon
- telephones
- speaking
- improvement
- brass
- 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 22
- 229910052799 carbon Inorganic materials 0.000 description 22
- 241000734220 Cotula coronopifolia Species 0.000 description 10
- 229910001369 Brass Inorganic materials 0.000 description 6
- 239000010951 brass Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 2
- 238000009987 spinning Methods 0.000 description 2
- 230000001702 transmitter Effects 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
- the object of this invention consists in spinning a brass socket upon the carbon.
- FIG. 1 is an inverted plan
- Fig. 2 a sectional elevation, of the said carbon, brass button, and spring.
- the button is marked a, the carbon 0, the spring 01, and b is the bolt by which the brass button is secured to the spring.
- the method of construction is as follows:
- the carbon is pressed or cut to a cylindrical shape, and a slight groove made around it, as
- FIG. 2 A hole is then bored alittle way into a brass button of a diameter equal to that of the carbon cylinder, and the carbon having been placed in the hole the brass is spun up into the groove, as shown. The spring and brass button are then bolted together, as shown.
- This invention is applicable to any electrical apparatus in which carbon is used for an electrode.
Description
T. A. WATSON. Speaking-Telephones.
No. 217.561. Patented July 15, 1879..
' f7 9km NFETERS. PNOTO-LITHOGRAPHER, WASHINGTONv D C.
UNITED STATES PATENT OEEIo THOMASQA. WATSON, OF BOSTON, MASSACHUSETTS.
IMPROVEMENT IN SPEAKlNG-TELEPHONES.
Specification forming part of Letters Patent No. 217.561, dated July 15, 1879 application filed May 21, 1879.
To all whom it may concern:
Be it known that I, THOMAS A. VVATSON, of Boston, in the State of Massachusetts, have invented an Improvement in Speaking-Telephones, of which the following is a specification.
It is common to use a piece of carbon as one of the electrodes of a speaking-telephone, and hitherto considerable trouble has arisen from the imperfect electrical attachment of the carbon to the metal by which it is supported.
To remedy this evil is the object of this invention; and the invention consists in spinning a brass socket upon the carbon.
I have applied this invention to an instrument known as Blakes Telephone, or Blakes Tra-nsmitter,in which oneof the electrodes consists of a piece of carbon attached to a heavy brass knob or button, in turn attached to one end of a watch-spring.
The drawings represent my improved construction, Figure 1 being an inverted plan, and Fig. 2 a sectional elevation, of the said carbon, brass button, and spring.
The button is marked a, the carbon 0, the spring 01, and b is the bolt by which the brass button is secured to the spring.
The method of construction is as follows:
:The carbon is pressed or cut to a cylindrical shape, and a slight groove made around it, as
shown in Fig. 2. A hole is then bored alittle way into a brass button of a diameter equal to that of the carbon cylinder, and the carbon having been placed in the hole the brass is spun up into the groove, as shown. The spring and brass button are then bolted together, as shown.
This invention is applicable to any electrical apparatus in which carbon is used for an electrode.
I claim- The carbon electrode 0, in combination with the brass button I), the latter being spun upon the former, substantially as described.
THOMAS A. WATSON.
Witnesses:
W. W. SWAN, H. Gr. OLMsTEn.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US217561A true US217561A (en) | 1879-07-15 |
Family
ID=2286963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US217561D Expired - Lifetime US217561A (en) | Improvement in speaking-telephones |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US217561A (en) |
-
0
- US US217561D patent/US217561A/en not_active Expired - Lifetime
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US217561A (en) | Improvement in speaking-telephones | |
| US569896A (en) | Edmund van cauwenberg | |
| US967514A (en) | Union check-valve. | |
| US786040A (en) | Policeman's mace. | |
| US979985A (en) | Flexible shaft. | |
| US203931A (en) | Improvement in connecting-tips for electrical conductors | |
| US258733A (en) | Ohaelbs ezard | |
| US408408A (en) | Soldering-iron | |
| US121789A (en) | Improvement in pitman-connections | |
| US358832A (en) | Ear-ring | |
| US355794A (en) | Speeder-flier | |
| US815153A (en) | Dental tool. | |
| US228305A (en) | boubqtjin | |
| US838638A (en) | Drill-chuck. | |
| US591443A (en) | Needle for repairing punctures in bicycle-tires | |
| US1248091A (en) | Fuse. | |
| US227726A (en) | Balance staff and wheel for watches | |
| US350621A (en) | Luis dbeschee | |
| US1536509A (en) | Hub and spoke connection | |
| US901719A (en) | Winch. | |
| US253017A (en) | Bracelet | |
| US293626A (en) | Electric bell-pull | |
| US176910A (en) | Improvement in bell-pull attachments | |
| US204563A (en) | Improvement in vehicle-tire tighteners | |
| US1010457A (en) | Axle-nut lock. |