Pocket barometer compendium having 1¾” silvered and struck twin-scale dial, the outer altitude scale with a range from 0–10,000ft, the inner calibrated in inches of mercury with a range from 21–31, the upper portion marked “Compensated,” the lower portion with the maker’s name “Negretti & Zambra, London,” and serial no. “12467.” Fine blued steel pointer set beneath a bevelled glass maintained within a rotating bezel with associated altitude scale. Conventional compensated 1¼” capsule-driven movement all contained within a drum-form case, central rib, and with engine-turned end rings. The verso with centrally-mounted compass having blued steel pointer with upper and lower bearings marked “N” and “S,” swinging over a bevelled outer card with cardinals and intercardinals, double-lined compass rose motive to centre. Case extension with pinned bow. Barometer compensation port and screw set to compass side.
The whole contained within its bespoke grained brown leather over wood case with green silk and velvet lining, the base with circular cut out compass viewing port. Snap closure on a button release.
The pocket barometer compendium retaining traces of original gilt finish, the dial with minor marks. The bezel stiff in rotation. The leather case with minor losses and abrasions. The hinge repaired, the button release and keeper replaced.
An unusual and attractive instrument in much above average condition. Serviced and calibrated, the barometer functions well with good progression and sensitivity. The compass finds north easily.
Crisp original condition overall – definitely a collector’s quality piece.
Dimensions: 2½” diameter x 1¼” deep
Stock No: CP0451