US136875A - Improvement in duplex telegraph-keys - Google Patents
Improvement in duplex telegraph-keys Download PDFInfo
- Publication number
- US136875A US136875A US136875DA US136875A US 136875 A US136875 A US 136875A US 136875D A US136875D A US 136875DA US 136875 A US136875 A US 136875A
- Authority
- US
- United States
- Prior art keywords
- metallic
- keys
- improvement
- circuit
- battery
- 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
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 210000003414 Extremities Anatomy 0.000 description 4
- 229910052697 platinum Inorganic materials 0.000 description 4
- 229920001875 Ebonite Polymers 0.000 description 2
- 210000001364 Upper Extremity Anatomy 0.000 description 2
- 230000000994 depressed Effects 0.000 description 2
- 230000000881 depressing Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 230000036633 rest Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L15/00—Apparatus or local circuits for transmitting or receiving dot-and-dash codes, e.g. Morse code
- H04L15/04—Apparatus or circuits at the transmitting end
- H04L15/06—Apparatus or circuits at the transmitting end with a restricted number of keys, e.g. separate key for each type of code element
- H04L15/08—Apparatus or circuits at the transmitting end with a restricted number of keys, e.g. separate key for each type of code element with a single key which transmits dots in one position and dashes in a second position
Definitions
- - graph-key which I call a wedge-key, by means of which a galvanic battery may be introduced into and removed from a circuit so that a current can be transmitted to a distant station without breaking or interrupting the circuit from that station;
- FIG. 4 is a diagram showing the battery and its connection.
- A is a metallic lever, similar to the lever of the common telegraph-key, which is pivoted in the usual manner upon asuitable base, and is provided at one extremity with the usual finger-knob H.
- B is a bar of some insulating substance, such as hard rubber, pivoted at right angles to the opposite extremity of the lever A. This bar is wedge-shaped at its upper extremity, and has attached to it, one on each side, plates of metal 0 O. The plates of metal are connected respectively to the opposite poles of a galvanic battery, L B, by the screw constructions K K, and wires F F.
- D D are two flat metallic springs, which are attached at their upper ends to a block of insulating material, M, supported on a proper standard of metal, and at their lower ends rest uponthe wed ge-shaped insulating'portion of the bar B, one on each side, but do no touch the metallic plates 0 0.
- a platinum point Upon one o these metallic springs, D, is a platinum point; I, which rests against a metallic projection, G, extending out from the standard S, so that when the bar B is depressed the point I and projection G are in contact, and the circuit is completed through them.
- the circuit from the line to earth is completed through screwconnection L, wire L, upper portion of metallic plate D, wire-O, in Fig. 3, standard S, metallic projection G, platinum point I, metallic spring D, wire E, and screw-connection E, to earth.
- the resistance of the wire 0 is equal to that of the battery L B.
- the operation of the key is as follows On depressing the knob of H of the lever A to send a signal, the bar B is elevated, and its wedge-shaped portion enters between the metallic springs D D, and separates them slightly. This breaks the circuit at I, but at the same time the metallic springs D D come into contact with the metallic plates 0 O on each side of the bar B, and the battery L B is thrown into the circuit through K F 0 D L back through E E D O F K to battery, and a signal is transmitted. Owing to the fact that the resistance at O is the same as that of the battery, the resistance of the circuit remains unchanged.
Description
PATENT OFFICE.
JOSEPH B. STEARNS, OF BOSTON, MASSACHUSETTS.
IMPROVEMENT IN DUPLEX TELEGRAPH-KEYS.
Specification forming part of Letters Patent No. 136,875, dated March 18, 1873.
(Men D.
- graph-key, which I call a wedge-key, by means of which a galvanic battery may be introduced into and removed from a circuit so that a current can be transmitted to a distant station without breaking or interrupting the circuit from that station;
The accompanying drawing forming a part I of this specification represents my invention,
Figurel being a front elevation of my improved key; Fig. 2 being a plan, and Fig. 3 an end elevation, of the same. Fig. 4, sheet2, is a diagram showing the battery and its connection.
Like letters in the figures refer to similar parts.
Description of the Drawing.
A is a metallic lever, similar to the lever of the common telegraph-key, which is pivoted in the usual manner upon asuitable base, and is provided at one extremity with the usual finger-knob H. B is a bar of some insulating substance, such as hard rubber, pivoted at right angles to the opposite extremity of the lever A. This bar is wedge-shaped at its upper extremity, and has attached to it, one on each side, plates of metal 0 O. The plates of metal are connected respectively to the opposite poles of a galvanic battery, L B, by the screw constructions K K, and wires F F. D D are two flat metallic springs, which are attached at their upper ends to a block of insulating material, M, supported on a proper standard of metal, and at their lower ends rest uponthe wed ge-shaped insulating'portion of the bar B, one on each side, but do no touch the metallic plates 0 0. Upon one o these metallic springs, D, is a platinum point; I, which rests againsta metallic projection, G, extending out from the standard S, so that when the bar B is depressed the point I and projection G are in contact, and the circuit is completed through them. The circuit from the line to earth is completed through screwconnection L, wire L, upper portion of metallic plate D, wire-O, in Fig. 3, standard S, metallic projection G, platinum point I, metallic spring D, wire E, and screw-connection E, to earth. The resistance of the wire 0 is equal to that of the battery L B.
The operation of the key is as follows On depressing the knob of H of the lever A to send a signal, the bar B is elevated, and its wedge-shaped portion enters between the metallic springs D D, and separates them slightly. This breaks the circuit at I, but at the same time the metallic springs D D come into contact with the metallic plates 0 O on each side of the bar B, and the battery L B is thrown into the circuit through K F 0 D L back through E E D O F K to battery, and a signal is transmitted. Owing to the fact that the resistance at O is the same as that of the battery, the resistance of the circuit remains unchanged.
What I claim as my invention, and desire to secure by Letters Patent of the United States, is-
. The combination of the lever A, insulatingbar B, metallic plates 0 O, metallic springs D D, insulating-block M, projection G, and connecting-wires F F L E, and O, substantially as and for the purpose as set forth.
JOSEPH B. STEARISS.
. Witnesses:
A. L. HAYES, WILLIAM A. HAYES, JR.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US136875A true US136875A (en) | 1873-03-18 |
Family
ID=2206291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US136875D Expired - Lifetime US136875A (en) | Improvement in duplex telegraph-keys |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US136875A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10035237B2 (en) | 2011-11-02 | 2018-07-31 | The Boeing Company | Robotic end effector including multiple abrasion tools |
-
0
- US US136875D patent/US136875A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10035237B2 (en) | 2011-11-02 | 2018-07-31 | The Boeing Company | Robotic end effector including multiple abrasion tools |
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