US250704A - Speaking telephone - Google Patents
Speaking telephone Download PDFInfo
- Publication number
- US250704A US250704A US250704DA US250704A US 250704 A US250704 A US 250704A US 250704D A US250704D A US 250704DA US 250704 A US250704 A US 250704A
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- US
- United States
- Prior art keywords
- ear
- piece
- telephone
- diaphragm
- mouth
- 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
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- 238000003780 insertion Methods 0.000 description 4
- 235000002407 Jessenia polycarpa Nutrition 0.000 description 2
- 244000232488 Jessenia polycarpa Species 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000035807 sensation Effects 0.000 description 2
- 239000002023 wood 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
- H04R11/00—Transducers of moving-armature or moving-core type
Definitions
- This invention relates to telephones having an ear-piece or sound-conveying tube in addition to the ordinary mouth-piece; and it consists in arranging the saidear-pieee or soundconveying tube on the opposite side of the diaphragm or vibrating plate from the mouthpiece. Additional sound-conveyin g tubes communicating with the diaphragmchamber on the same or ou opposite sidcsotthe diaphragm can be used.
- Figure 1 is a plan and Fig. 2 a sectional view of a telephone embodying the invention.
- A is the table to which the instrument is attached.
- the blocks B B are two blocks of wood held together by screws a, and between which is clamped a diaphragm of thin metal, d, as shown.
- the blocks B B are, one or both of them, secured tothe table by screws. (Not shown.) Their inner faces are concaved, as shown, to form a chamber, G,within which the diaphragm may vibrate.
- the front block, B has an opening for the insertion of the mouth-piece M
- the rear block, B' has an opening for the insertion of one end of an electro-magnet, E, the other end of which is made fast to a bracket, b, screwed to the table, as' shown.
- the electro-magnet E has a polarized core. Two screw-cups in the table, connected with the electro-magnet by wires, are marked s s.
- D D are two trumpet-shaped ear-pieces, counected by flexible tubes with the chamber on either side of the diaphragm, the tubes for that purpose passing through openings or slots in vthe blocks B B.
- the operation is as follows: The person about to talk with the telephone holds one ot' the ear-pieces D tohis ear and talks in front of the mouth-piece M in the ordinary manner, pinching the exible tube, however, while he himselt' is talking to prevent the unpleasant sensation of hearing his own voice through the instrument; but when receiving a reply through the same instrument as a receiver he. releases the tube from the extra pressure ot the fingers and hears the return message through the ear-piece at his ear.
- a telephone iu which the receiving and transmitting apertures are placed upon opposite sides ofthe vibrating plate and provided with devices for communicating with the ear and mouth, respectively.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Prostheses (AREA)
Description
A. G. BELL. SPEAKING TELEPHONE.
l` N0- 250.704. Patented Dec.13.1881.
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UNITED STATES PATENT OFFICE.
ALEXANDER Gr. BELL, OF WASHINGTON, DISTRICT OF COLUMBA.
SPEAKING-TELEPHONE.
SPECIFICATION forming part of Letters Patent No. 250,704, dated December 13, 1881.
i Application filed December 2G, 1879.
To all whom it may concern iBe it known that I, ALEXANDER GRAHAM BELL, of Washington, District of Columbia, have invented an Improvement in Speaking- Telephones, of which the following is a specitication. v
This invention relates to telephones having an ear-piece or sound-conveying tube in addition to the ordinary mouth-piece; and it consists in arranging the saidear-pieee or soundconveying tube on the opposite side of the diaphragm or vibrating plate from the mouthpiece. Additional sound-conveyin g tubes communicating with the diaphragmchamber on the same or ou opposite sidcsotthe diaphragm can be used.
In the accompanying drawings, which form a part of this specification, Figure 1 is a plan and Fig. 2 a sectional view of a telephone embodying the invention.
Ais the table to which the instrument is attached.
B B are two blocks of wood held together by screws a, and between which is clamped a diaphragm of thin metal, d, as shown. The blocks B B are, one or both of them, secured tothe table by screws. (Not shown.) Their inner faces are concaved, as shown, to form a chamber, G,within which the diaphragm may vibrate. The front block, B, has an opening for the insertion of the mouth-piece M, and the rear block, B', has an opening for the insertion of one end of an electro-magnet, E, the other end of which is made fast to a bracket, b, screwed to the table, as' shown. The electro-magnet E has a polarized core. Two screw-cups in the table, connected with the electro-magnet by wires, are marked s s.
D D are two trumpet-shaped ear-pieces, counected by flexible tubes with the chamber on either side of the diaphragm, the tubes for that purpose passing through openings or slots in vthe blocks B B.
The operation is as follows: The person about to talk with the telephone holds one ot' the ear-pieces D tohis ear and talks in front of the mouth-piece M in the ordinary manner, pinching the exible tube, however, while he himselt' is talking to prevent the unpleasant sensation of hearing his own voice through the instrument; but when receiving a reply through the same instrument as a receiver he. releases the tube from the extra pressure ot the fingers and hears the return message through the ear-piece at his ear.
It is obvious that conversation can be carried on more readily than when the operator alternately speaks and listens at the mouthpiece.
It is also obvious that where two ear-pieces are attached to the telephone, as shown in the drawings, two persons can receive a message at the same time. might be made to communicate with the chamber within the instrument; but for ordinary purposes one tube provided with an ear-piece in addition to thev mouth-piece is suflicient, and it is immaterial whether the tube communicates with the chamber in front of or in rear ot' the diaphragm.
When more than one ear-piece are attached it may be convenient for the operator to einploy one of them for a mouth-piece.
Having thus fully described my invention and the manner in which the same is or may be carried into effect, what I claim, and desire to secure by Letters Patent, is-
A telephone iu which the receiving and transmitting apertures are placed upon opposite sides ofthe vibrating plate and provided with devices for communicating with the ear and mouth, respectively.
ALEXANDER GRAHAM BELL.
Witnesses:
G.J. HEDRICK, PHILIP MAURO.
So three or more tubesf
Publications (1)
Publication Number | Publication Date |
---|---|
US250704A true US250704A (en) | 1881-12-13 |
Family
ID=2320006
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US250704D Expired - Lifetime US250704A (en) | Speaking telephone |
Country Status (1)
Country | Link |
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US (1) | US250704A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3114802A (en) * | 1961-11-15 | 1963-12-17 | American Optical Corp | Mouthpiece microphone unit |
-
0
- US US250704D patent/US250704A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3114802A (en) * | 1961-11-15 | 1963-12-17 | American Optical Corp | Mouthpiece microphone unit |
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