US476026A - Telephone - Google Patents
Telephone Download PDFInfo
- Publication number
- US476026A US476026A US476026DA US476026A US 476026 A US476026 A US 476026A US 476026D A US476026D A US 476026DA US 476026 A US476026 A US 476026A
- Authority
- US
- United States
- Prior art keywords
- strip
- transmitter
- diaphragm
- telephone
- 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
- 230000001702 transmitter Effects 0.000 description 12
- 239000004020 conductor Substances 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 229920000742 Cotton Polymers 0.000 description 2
- 229910000004 White lead Inorganic materials 0.000 description 2
- 241000209149 Zea Species 0.000 description 2
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 235000005822 corn Nutrition 0.000 description 2
- 235000005824 corn Nutrition 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 230000001681 protective Effects 0.000 description 2
- 230000036633 rest Effects 0.000 description 2
- 239000002966 varnish 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
- H04R21/00—Variable-resistance transducers
- H04R21/02—Microphones
- H04R21/021—Microphones with granular resistance material
Definitions
- STEPHEN F SHERMAN, OF NEl/V YORK, ASSIGNOR OF ONE-HALF TO GEORGE F. SHAVER, OF YONKERS, NEWV YORK.
- My invention is an improvement in telephones; and it consists in a variable resistto ance in the form of a conducting strip or ribbon folded or creased to form plaits, which is in the primary tranemitter-circuit and is connected with the diaphragm of the transmitter either directly or indirectly, whereby the plaits of the strip are opened and closed and the resistance through the entire plaited conductor varied with the movements of the diaphragm, and in certain other details hereinafter described and claimed.
- Figure 1 is a plan and view for the transmitter seen from the front.
- Fig. 2 is a side view in cr0ss-section on the line x a: of Fig.1.
- Fig. 3 is a perspective view of the plaitedre- 2 5 sistance-strip.
- A is the outer casing of the transmitter, in which the mouth-piece B and the operative parts of the transmitter are supported.
- O is the diaphragm.
- D is the multiplying-lever, pivoted to the casing at a and carrying on its end a conducting block (1, to Which one end of the plaited conducting-strip E is attached.
- This plaited conductor rests in a horizontal position upon the floor of a'protective casing F and is attached at its other end to ablock on the end of an adj Listing-screw G.
- This screw works in a thread in the casing A, and by turning the screw in or out the folds of the 40 conductor E can be made as close or as open as is desired.
- An electric battery is shown connected with the lever D and embracing within its circuit the conductor E and the primary coils of an induction-coil, the secondary coils of which are connected with the linewires.
- the conducting-strip E should be of high resistance compared with the other resistance of the primary or battery circuit. It can be made in the following way: A flexible strip or ribbon of silk, cotton, paper, or other suitable material is painted with white lead or other suitable paint or varnish and while this coating is still moist is coated with a layer of powdered carbon. There is thus formed a" carbonized ribbon which is a corn ductor of electricity of high resistance, or a thin strip of vulcanized fiber maybe used; butl do not limit myself to a ribbon of any amalgam.
- the operation of the transmitter is as follows: When the diaphragm O is caused to vibrate by sound-waves, its vibrations are transmitted through the lever D, by which they are considerably enlarged, to the plaited strip E. The folds of this strip are closed or opened, according to the direction of motion of the diaphragm and lever. Thus the resisttance of the strip, and hence of the primary circuit, is varied, and the currents are induced in the secondary coils of the induction-coil, which traverse the line-wires and operate the receiver, where the sounds which set up the vibration of the diaphragm of the transmitter are reproduced.
- the ribbon or conductingstrip should be narrow and thin, but strong, and should be covered with the powdered carbon as evenly as possible.
Description
NI'TED STATEs ATENT FFICE.
STEPHEN F. SHERMAN, OF NEl/V YORK, ASSIGNOR OF ONE-HALF TO GEORGE F. SHAVER, OF YONKERS, NEWV YORK.
TELEPHONE.
SPECIFICATION forming part of Letters Patent No. 476,026, dated May 31, 1892. Application filed March 2,1892- Serial No. 423,494. (No model.)
To all whom it may concern:
Be it known that I, STEPHEN F. SHERMAN, a citizen of the United States of America, residing in the city, county, and State of New York, have invented certain new and useful Improvements in Telephones, of which the following is a specification.
My invention is an improvement in telephones; and it consists in a variable resistto ance in the form of a conducting strip or ribbon folded or creased to form plaits, which is in the primary tranemitter-circuit and is connected with the diaphragm of the transmitter either directly or indirectly, whereby the plaits of the strip are opened and closed and the resistance through the entire plaited conductor varied with the movements of the diaphragm, and in certain other details hereinafter described and claimed. Referring to the accompanying drawings,
Figure 1 is a plan and view for the transmitter seen from the front. Fig. 2 is a side view in cr0ss-section on the line x a: of Fig.1. Fig. 3 is a perspective view of the plaitedre- 2 5 sistance-strip.
A is the outer casing of the transmitter, in which the mouth-piece B and the operative parts of the transmitter are supported.
O is the diaphragm. D is the multiplying-lever, pivoted to the casing at a and carrying on its end a conducting block (1, to Which one end of the plaited conducting-strip E is attached. This plaited conductor rests in a horizontal position upon the floor of a'protective casing F and is attached at its other end to ablock on the end of an adj Listing-screw G. This screw works in a thread in the casing A, and by turning the screw in or out the folds of the 40 conductor E can be made as close or as open as is desired. An electric battery is shown connected with the lever D and embracing within its circuit the conductor E and the primary coils of an induction-coil, the secondary coils of which are connected with the linewires.
The conducting-strip E should be of high resistance compared with the other resistance of the primary or battery circuit. It can be made in the following way: A flexible strip or ribbon of silk, cotton, paper, or other suitable material is painted with white lead or other suitable paint or varnish and while this coating is still moist is coated with a layer of powdered carbon. There is thus formed a" carbonized ribbon which is a corn ductor of electricity of high resistance, or a thin strip of vulcanized fiber maybe used; butl do not limit myself to a ribbon of any partieular composition.
The operation of the transmitter is as follows: When the diaphragm O is caused to vibrate by sound-waves, its vibrations are transmitted through the lever D, by which they are considerably enlarged, to the plaited strip E. The folds of this strip are closed or opened, according to the direction of motion of the diaphragm and lever. Thus the resisttance of the strip, and hence of the primary circuit, is varied, and the currents are induced in the secondary coils of the induction-coil, which traverse the line-wires and operate the receiver, where the sounds which set up the vibration of the diaphragm of the transmitter are reproduced.
The ribbon or conductingstrip should be narrow and thin, but strong, and should be covered with the powdered carbon as evenly as possible.
Without limiting myself to the precise details shown, what I claim, and desire to secure by Letters Patent of the United States 1s- 1. In a telephone-transmitter, the combination of a vibrating diaphragm anda variable resistance connected therewith and included in the circuit, made of a piece of conducting material creased or folded toform plaits, substantially as described.
2. In a telephone-transmitter, the combination of a vibrating diaphragm and a variable resistance connected therewith and included in the circuit, made of a piece of carbon creased or folded to form plaits, substantially as described. 5
Subscribed by me, in New York city, this 29th day of February, 1892.
STEPHEN F. SHERMAN.
In presence of- THOMAS EWING, J r., M. W. CoPPoRTo.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US476026A true US476026A (en) | 1892-05-31 |
Family
ID=2544882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US476026D Expired - Lifetime US476026A (en) | Telephone |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US476026A (en) |
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0
- US US476026D patent/US476026A/en not_active Expired - Lifetime
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