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Fig. 272: The Morse Key; Fig. 273: Key Board; and Fig. 274: Telegraph Key and Relay

  • 1896

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  • 17 cm H
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Rights Public Domain Mark 1.0
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  • Courtesy of Science History Institute

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  • Page 482, Shelfmark TK151 .H49 1896

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Hawkins, N. (Nehemiah). “Fig. 272: The Morse Key; Fig. 273: Key Board; and Fig. 274: Telegraph Key and Relay.” New Catechism of Electricity: A Practical Treatise. New York, New York: T. Audel & Company, 1896. TK151 .H49 1896. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/gnup7h0.

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