Shackladys Antiques has dated this piece to the 19th Century.
The ink trace, or barogram, on the recording paper is a visual record of changes in pressure.

The aneroid barometer mechanism has eight stacked vacuum capsules and utilises a gate suspension, a refinement developed to improve sensitivity. The barograph has its original glass ink bottle recessed into the case along with makers label.
Dimensions
Height 9 Inches
Width 14.5 Inches
Depth 8.5 Inches
Shackladys Antiques has dated this piece to the 19th Century.
You can view the stock and full dealer information on the Shackladys Antiques Profile Page
Shackladys Antiques is a registered member of LAPADA