Fine and rare 5inch [13cm] diameter brass-cased Aneroid Barometer - No. 3825. The well-engraved silvered brass dial bearing curved Fahrenheit mercury thermometer, unique serial number and protected by bevelled plate glass.
Dent, a renowned maker of quality clocks, secured the UK franchise from the French aneroid barometer patentee Lucien Vidi and sold many thousands - each consecutively numbered - from 1844 until the patent expired in 1860.
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