chemical telegraph

noun

Definition of chemical telegraph

: a telegraphic apparatus by which a message is recorded on a moving slip of paper moistened with a solution having a chemical composition that is altered on the passage of current through a stylus

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“Chemical telegraph.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/chemical%20telegraph. Accessed 7 Mar. 2021.

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