US166859A - Improvement in chemical telegraphy - Google Patents

Improvement in chemical telegraphy Download PDF

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US166859A
US166859A US166859DA US166859A US 166859 A US166859 A US 166859A US 166859D A US166859D A US 166859DA US 166859 A US166859 A US 166859A
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improvement
chemical
telegraphy
tellurium
paper
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00Duplicating or marking methods; Sheet materials for use therein
    • B41M5/20Duplicating or marking methods; Sheet materials for use therein using electric current

Definitions

  • the object of this invention is to record dots and dashes upon cheinicallyprepared paper by electric decomposition for telegraphing.
  • the invention consists in forming the decomposing stylus or pen of tellurium and wetting the paper with water or any liquid conductor. I prefer water to which has been added a quantity of hydrate lime or potash.
  • This decomposition of tellurium has the peculiar characteristic over all other metals that it produces the mark with hydrogen, and also that the-mark, at its first formation, is not a precipitate like the ferrocyanide of iron when an iron pen and ferrocyanide of potassium are used, which has a tendency to adhere to the stylus after the current has ceased, and produce attenuation of the signals; but the permanent color is formed by the action of the air after the decomposition has taken place: hence the signals will be much sharpen I claim as my invention- 1.

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  • Paper (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)

Description

UNITED STATES PATENT QFFIGE.
THOMAS A. EDISON, OF NEWARK, NEW JERSEY, ASSIGNOR TO HIMSELF AND GEORGE HARRINGTON, OF WASHINGTON, D. O.
IMPROVEMENT IN CHEMICAL TELEGRAPHY.
Specification forming part of Letters Patent No. 166,859, dated August 17, 1875; application filed July 25, 1874.
CASE No. 88.
To all whom it may concern Be it known that I, THoMAs A. EDISON, of Newark, in the county of Essex and State of New Jersey, have invented an Improvement in Chemical Telegraphs, of which the following is a specification:
The object of this invention is to record dots and dashes upon cheinicallyprepared paper by electric decomposition for telegraphing.
The invention consists in forming the decomposing stylus or pen of tellurium and wetting the paper with water or any liquid conductor. I prefer water to which has been added a quantity of hydrate lime or potash.
It the stylus, tipped with tellurium, is connected to the zinc end of a battery, and the drum or plate upon which the moistened paper rests be connected to the copper end of the battery, hydrogen is evolved at the point Where the tellurinm touches the paper. The hydrogen combines with the tellurium to form hydrotelluric acid, which has a red color, but is instantly decomposed in contact with the air, and forms a black pigment, which is permanent. I have found that this reaction is more delicate than that of iodide of potassium, which is the most delicate known in chemistry. This decomposition of tellurium has the peculiar characteristic over all other metals that it produces the mark with hydrogen, and also that the-mark, at its first formation, is not a precipitate like the ferrocyanide of iron when an iron pen and ferrocyanide of potassium are used, which has a tendency to adhere to the stylus after the current has ceased, and produce attenuation of the signals; but the permanent color is formed by the action of the air after the decomposition has taken place: hence the signals will be much sharpen I claim as my invention- 1. The method of recording telegraph or other signals by the electro -decomposition upon moistened paper or other material of a t stylus of tellurium.
A paper moistened with hydrates of lime, potash, or the cyanides of potassium, for use with a tellurium stylus, for the purpose set forth.
- THOS. A. EDISON. Witnesses: GEO. T. PINCKNEY,
OHAs. H. SMITH.
Signed by me this 1st day of June, A. D."
US166859D Improvement in chemical telegraphy Expired - Lifetime US166859A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1039074B (en) * 1956-03-15 1958-09-18 Werner Schiebeler Dipl Phys Dr Arrangement for the electrolytic production of characters and symbols
US3075193A (en) * 1958-04-28 1963-01-22 Schiebeler Werner Electrolytic process for producing characters and marks
US3541576A (en) * 1967-07-12 1970-11-17 Itt Tellurium electrode printer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1039074B (en) * 1956-03-15 1958-09-18 Werner Schiebeler Dipl Phys Dr Arrangement for the electrolytic production of characters and symbols
US3075193A (en) * 1958-04-28 1963-01-22 Schiebeler Werner Electrolytic process for producing characters and marks
US3541576A (en) * 1967-07-12 1970-11-17 Itt Tellurium electrode printer

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