A mahogany barograph Negretti & Zambra, London, early 20th century With ten-part vacuum chamber within lacquered brass armature operating inked pointer for the clockwork driven rotating paper-scale lined drum, the mechanism baseplate stamped NEGRETTI & ZAMBRA, LONDON, R/10570, REGENCY JEWELLED MOVEMENT, the case with five panel bevel-glazed cover and chart drawer to apron, 42cm wide; with An ivorine pocket weather forecasting calculator, also by Negretti & Zambra, early 20th century, 5.5cm diameter (2).
A mahogany barograph Negretti & Zambra, London, early 20th century With ten-part vacuum chamber within lacquered brass armature operating inked pointer for the clockwork driven rotating paper-scale lined drum, the mechanism baseplate stamped NEGRETTI & ZAMBRA, LONDON, R/10570, REGENCY JEWELLED MOVEMENT, the case with five panel bevel-glazed cover and chart drawer to apron, 42cm wide; with An ivorine pocket weather forecasting calculator, also by Negretti & Zambra, early 20th century, 5.5cm diameter (2).
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