The early telegraph was an electro-chemical technology that used a current passing through chemically coated paper to record a message from a faraway station. The current then subsided as gradually as it came on, until it entirely disappeared, and was then succeeded by a negative current, which bleached instead of colored, the paper this also gradually increased, until, as with the positive current, it burned the paper, and then subsided, to be followed by the positive current. The paper was set on fire by the flame, and produced considerable smoke. On the evening of February 19, 1852, a scientist at the New Haven station of the nascent telegraph witnessed something extraordinary:Ī blue line appeared upon the paper, which gradually grew darker and larger, until a flame of fire followed the pen, and burned through a dozen thicknesses of the prepared paper.
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June 2023
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