English, pre 1853, the silvered face engraved 'E. J. DENT, Paris, 3255' the silvered register calibrated in barometric inches with usual annotations over curved mercury tube engraved 20-160 and FAHRENHEIT'S SCALE, lacquered brass case with engine turned bezel, beveled glass window with pointer, suspension loop to top, in original fitted black leather covered case
Footnote: responds to plastic bag test
English, pre 1853, the silvered face engraved 'E. J. DENT, Paris, 3255' the silvered register calibrated in barometric inches with usual annotations over curved mercury tube engraved 20-160 and FAHRENHEIT'S SCALE, lacquered brass case with engine turned bezel, beveled glass window with pointer, suspension loop to top, in original fitted black leather covered case
Footnote: responds to plastic bag test
Auction: Fine Instruments of Science & Medicine, 29th Nov, 2023