Patent Model - Improvement in Signal Apparatus for District Telegraphs

Maker and role
Edward Calahan (b.1838, d.1912), Patentee
The American District Telegraph Company, Assignee
Production date
Jul 16 1872
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Object detail

Wood, iron, brass
11 x 7 x 7" (27.9 x 17.8 x 17.8cm)
Calahan's patent "is for sending pulsations from a house or building to a central station, indicating the need of assistance, such as in cases of fire, robbery, sickness, &c., by giving a series of strokes on a bell, or moving a pointer, to indicate numbers. (Patent Number 129,526)
Object number
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