Alexander Bain's chemical telegraph, unknown maker, England, 1850. Includes key not shown on photograph.
Alexander Bain's chemical telegraph, unknown maker, England, 1850.
This instrument was used by the Electric Telegraph Company for a while instead of a needle type receiver. Messages were prepared by perforating a paper strip, or slip. The code used was similar to Morse. The slip was then fed through the transmitting instrument by clockwork. When the spring mechanism inside the instrument detected a perforated hole, it completed an electrical connection, which would be transmitted to the receiving instrument. The receiver comprised a roll of dampened and chemically treated paper slip driven by clockwork beneath a steel 'style' connected to the line wire. Each electric pulse left a mark on the dampened strip, due to the chemicals it had been treated with. Thus a code could be used to transmit messages. Alexander Bain was the originator of perforated paper tape used for telegraph purposes.
- Object Number:
- component - object
- Donated by H.M. Postmaster General
Cite this page
We encourage the use and reuse of our collection data.
Data in the title, made, maker and details fields are released under Creative Commons Zero
Descriptions and all other text content are licensed under a Creative Commons Attribution 4.0 licence
Download catalogue entry as json
Download manifest IIIF
Our records are constantly being enhanced and improved, but please note that we cannot guarantee the accuracy of any information shown on this website.