Joseph Somalvico, London. c.1800-10.

A fine Georgian mahogany stick barometer by leading London maker of the period, Joseph Somalvico.
The herring bone veneered case of good colour and finish, is edge moulded and outlined with chevron stringing which continues around the glazed door which sits below the architectural pediment.
The silvered register plate is fitted with a mercury thermometer and manually operated vernier. The plate is well engraved with a 27-31" pressure and Fahrenheit temperature scale along with the maker's name 'J. Somalvico & Co, No.81 Holborn, London'.
The exposed mercury tube is fitted with a portable boxwood cistern, concealed behind a turned cistern cover with ebony and ivory roundel decoration.

Joseph Somalvico was the founder of the successful Somalvico family of barometer makers that worked in London from the late 18th until the last half of the 19th century.
The earliest address shown for Joseph Somalvico is '81 Holborn' as on this barometer, where he is listed as working from 1795.