P A Oxley Antique Clocks & Barometers has dated this piece to the 1800s.
The silvered brass scale calibrated from 27" to 31" and engraved with weather indications.
The thermometer with a silvered brass scale calibrated from 30º to 110º Fahrenheit and from 5º to 35º Reaumur, contained within a mahogany moulded surround with a bowed glass. The superbly made mahogany case of excellent workmanship with figured veneers to the bowed front and a bowed glass to the main scale with cushion moulding above. The base with an ebonised cistern cover, ebony mouldings, further ebony inlay to the sides and a transportation screw built within the case. The case also with ebony line inlay and ebony mouldings throughout the main trunk. Height: 38½"

Note: Nathaniel Worthington & James Allan were excellent instrument makers. Their quality and workmanship originate from their Masters Matthew Berge & Jesse Ramsden. Worthington was apprenticed to Berge and took over the business with Allan in 1819 at 196 Picadilly, London.
Historical Fact: Around the period that this barometer was made the first Railway in a Capital City was built from London to Greenwich.
P A Oxley Antique Clocks & Barometers has dated this piece to the 1800s.
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P A Oxley Antique Clocks & Barometers is a registered member of LAPADA