Patent Model - Improvement in Fire-Alarm Thermometers
Maker and role
Augusta Guest (b.1839, d.1920), Patentee
Production date
Oct 18 1870
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Object detail
Media/Materials
Wood, glass
Measurements
2 1/2 x 1" (6.4 x 2.5cm)
Description
Guest's patent constructs "an instrument for closing the circuit of an electric fire-alarm, as soon as the atmosphere which surrounds said instrument has reached a certain degree of heat." It "relates to the use of a glass thermometer containing quicksilver." (Patent Number 108,352)
Collection
Object number
2015.14.1236a,b
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