A Late Victorian Black Laquered Fortin Barometer By Negretti

A LATE VICTORIAN LACQUERED BRASS FORTIN-TYPE LABORATORY MERCURY STICK BAROMETER Negretti and Zambra, London, late 19th century The instrument with slender cylindrical case pierced with a vertical slot to reveal the tube incorporating sliding Vernier collar reading against a silvered scale calibrated in barometric inches bordering the right hand side opposing millibar scale to the left, the shaft with Vernier adjustment disc to right over engraved signature H. Negretti & Zambra, 1 Hatton Garden, 122 Regent St. W. & 39 Cornhill, London and applied mercury tube FAHRENHEIT thermometer with canted silvered scale and enclosed bulb to front, the base with cylindrical glass chamber enclosing mercury and incorporating inverted ivory level pointer to interior clamped between horizontal plates over cylindrical cistern and adjustment screw to base, mounted via a brass ring to top and base collar-bracket with triple securing screws onto a rectangular ogee moulded walnut panel with curved top and base and inset with a brass-bordered trade plate inscribed NEGRETTI & ZAMBRA. METEOROLOGICAL, INST'T MAKERS, TO HER MAJESTY, 1 HATTON GARDEN E.C., 59 CORNHILL E.C., 122 REGENT ST. W., LONDON. to centre.The instrument 102cm (40ins) high; the wall panel 103cm (44ins) high, 14cm (5.5ins) wide.
A LATE VICTORIAN LACQUERED BRASS FORTIN-TYPE LABORATORY MERCURY STICK BAROMETER Negretti and Zambra, London, late 19th century The instrument with slender cylindrical case pierced with a vertical slot to reveal the tube incorporating sliding Vernier collar reading against a silvered scale calibrated in barometric inches bordering the right hand side opposing millibar scale to the left, the shaft with Vernier adjustment disc to right over engraved signature H. Negretti & Zambra, 1 Hatton Garden, 122 Regent St. W. & 39 Cornhill, London and applied mercury tube FAHRENHEIT thermometer with canted silvered scale and enclosed bulb to front, the base with cylindrical glass chamber enclosing mercury and incorporating inverted ivory level pointer to interior clamped between horizontal plates over cylindrical cistern and adjustment screw to base, mounted via a brass ring to top and base collar-bracket with triple securing screws onto a rectangular ogee moulded walnut panel with curved top and base and inset with a brass-bordered trade plate inscribed NEGRETTI & ZAMBRA. METEOROLOGICAL, INST'T MAKERS, TO HER MAJESTY, 1 HATTON GARDEN E.C., 59 CORNHILL E.C., 122 REGENT ST. W., LONDON. to centre.The instrument 102cm (40ins) high; the wall panel 103cm (44ins) high, 14cm (5.5ins) wide.