Telegraph Sounder
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“The sounder is a telegraphic receiver consisting of an electromagnet, and a pivoted armature that plays up and down between its stops as the circuit is alternately made and broken. the message is ‘read by sound,’ i.e., from the clicks made by the armature, substantially as indicated [before].” -Avery 1895
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Telephone and Telegraph IndustrySource
Elroy M. Avery School Physics (New York: Sheldon and Company, 1895) 566
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