An oak cased barograph Negretti & Zambra, London, early 20th century With seven-part expansion chamber within lacquered brass armature signed NEGRETTI & ZAMBRA, LONDON operating inked pointer for the rotating paper-scale lined drum, with five bevel glazed panels to cover and on a cavetto moulded base with chart drawer to front, 36cm wide.
An oak cased barograph Negretti & Zambra, London, early 20th century With seven-part expansion chamber within lacquered brass armature signed NEGRETTI & ZAMBRA, LONDON operating inked pointer for the rotating paper-scale lined drum, with five bevel glazed panels to cover and on a cavetto moulded base with chart drawer to front, 36cm wide.
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.jpg "Quelle: Christie's")
.jpg "Quelle: Christie's")
