Patent Model - Improvement in Duplex Telegraphs
Maker and role
Merritt Gally, Patentee
Production date
Jun 01 1875
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Object detail
Media/Materials
Wood, copper, steel, paper
Measurements
3 x 7 x 9" (7.6 x 17.8 x 22.9cm)
Description
Gally broadly claims that he has been the first to discover "this method for reducing the resistance of a circuit or coils to an operating current..." (Patent Number 163,923)
Collection
Object number
2015.14.1958a,b
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Maker
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