Edward Dent - London. Rare 5inch [13cm] diameter brass cased aneroid barometer – No. 3825. c1855 
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.