US166861A - Improvement in chemical telegraphy - Google Patents

Improvement in chemical telegraphy Download PDF

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US166861A
US166861A US166861DA US166861A US 166861 A US166861 A US 166861A US 166861D A US166861D A US 166861DA US 166861 A US166861 A US 166861A
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chemical
telegraphy
improvement
iron
protosalt
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/20—Duplicating or marking methods; Sheet materials for use therein using electric current

Definitions

  • the object of this invention is to record dots and dashes upon chemically-prepared paper by electro-decomposition for telegraphic purposes.
  • the invention consists in eombinin g a protosalt of iron with the sulpho-eyanide of potassium, in which the paper is to be moistened.
  • the recording-stylus is formed of platinum, or metal that is not oxidized by the nascent oXygen.
  • the action is as follows: When the copper end of a galvanic battery is connected to the platina stylus, resting on the paper that is moistened in the abovesolution, and the zinc end is connected to the metal upon which it rests, oxygen is evolved at the platina point. This raises the protoxide to a Sesquioxide or peroxide, when the sulpho-cyanide of potassium, which has no action on a protosalt of iron, combines with the higher oxide to form the blood-red sulphocyanide of iron.
  • the reaction is very delicate. I prefer to use the protosalt of iron in the form of the protosulphate of iron. Chloride of sodium added to the solution increases the delicacy.

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  • Respiratory Apparatuses And Protective Means (AREA)
  • Investigating Or Analysing Biological Materials (AREA)

Description

UNITED STATES PATENT OEFIOE.
THOMAS A. EDISON, OF NEWARK, NEW JERSEY, ASSIGNOR To HIMSELE AND GEORGE HARRINGTON, OF WASHINGTON, D. O.
lMPROVEMENT IN CHEMICAL TELEGRAPHY.
Specification forming part of Letters Patent No. 166,861, dated August 17, 1875; application filed July 25, 1874.
CASE No. 90.
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 Telegrephs, of which the following is a specification:
The object of this invention is to record dots and dashes upon chemically-prepared paper by electro-decomposition for telegraphic purposes.
The invention consists in eombinin g a protosalt of iron with the sulpho-eyanide of potassium, in which the paper is to be moistened. The recording-stylus is formed of platinum, or metal that is not oxidized by the nascent oXygen.
The action is as follows: When the copper end of a galvanic battery is connected to the platina stylus, resting on the paper that is moistened in the abovesolution, and the zinc end is connected to the metal upon which it rests, oxygen is evolved at the platina point. This raises the protoxide to a Sesquioxide or peroxide, when the sulpho-cyanide of potassium, which has no action on a protosalt of iron, combines with the higher oxide to form the blood-red sulphocyanide of iron.
The reaction is very delicate. I prefer to use the protosalt of iron in the form of the protosulphate of iron. Chloride of sodium added to the solution increases the delicacy.
I claim as my invention- The combination of a protosalt'of iron, sulphO-cyanide of potassium, and a non-oxidizahle stylus, for the purposes set forth.
Signed by me this 1st day of June, A. D.
THOS. A. EDISON.
Witnesses GEO. T. PINcKNEY, CHAS. H. SMITH.
US166861D Improvement in chemical telegraphy Expired - Lifetime US166861A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2910648A (en) * 1956-12-31 1959-10-27 Ibm Low voltage indicator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2910648A (en) * 1956-12-31 1959-10-27 Ibm Low voltage indicator

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