An oak cased barograph Negretti & Zambra, London, early 20th century With seven-part vacuum chamber within lacquered brass armature operating inked pointer for the rotating paper scale lined drum, with mercury thermometer and signed NEGRETTI & ZAMBRA, LONDON to baseplate, with five bevelled glass cover, on moulded base incorporating apron drawer and squab feet, 36cm wide.
An oak cased barograph Negretti & Zambra, London, early 20th century With seven-part vacuum chamber within lacquered brass armature operating inked pointer for the rotating paper scale lined drum, with mercury thermometer and signed NEGRETTI & ZAMBRA, LONDON to baseplate, with five bevelled glass cover, on moulded base incorporating apron drawer and squab feet, 36cm wide.
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.jpg "Quelle: Christie's")
.jpg "Quelle: Christie's")
