Original Retro has dated this Antique Surveying Aneroid Barometer to the 1900s.
Surveying barometer with a silvered 4.5 Inch dial with an outer ring Vernier 0-5.
The inner scales comprising altitude 0 - 3000 feet, barometric scale 28 - 31 InHg.

The dial marked: Compensated and Negretti & Zambra London - 550
about the altitude scale an blackened brass vernier position wheel to the side and a brass screw set at 4
o'clock.
The barometer comes with it original brown leather and red velvet lining case with leather straps.
The barometer is good working order.
Original Retro has dated this Antique Surveying Aneroid Barometer to the 1900s.
You can view the stock and full dealer information on the Original Retro Profile Page