P A Oxley Antique Clocks & Barometers has dated this piece to the Georgian era.
The dial is also engraved with weather indications ranging from Very Dry to Stormy. The makers name J. D. Downes, Yarmouth is also engraved to the top half of the scale.

The mahogany case has an exposed mercury tube, veneered either side with herringbone mahogany veneer. The mahogany cistern cover is unusually inlaid with ebony and bone. The pediment is typical of the period with a moulded architectural top and central brass finial.
A high quality instrument.
Height: 38" / C.1790
P A Oxley Antique Clocks & Barometers has dated this piece to the Georgian era.
You can view the stock and full dealer information on the P A Oxley Antique Clocks & Barometers Profile Page
P A Oxley Antique Clocks & Barometers is a registered member of LAPADA