William Harris & Co. - London. Rare Georgian mahogany bow-fronted Thermometer. 
Good quality and unusual early 19th Century mahogany-cased bow-front wall Thermometer. The cavetto pediment over well engraved silvered brass plate, signed by the maker, recording temperatures from 30-210 degrees Fahrenheit, bearing long mercury thermometer and protected by bowed glass cover. Matching cavetto moulding to the base. [40cm]. c1820 A noted optical and mathematical instrument maker, working from premises at 50 Holborn from c1815-41.