An early 20th Century barograph, by Negretti & Zambra, London, with brass cylinder, eleven-coil vacuum chamber, two ink bottles, two arms, one inscribed "Barograph", the other "Thermograph", contained in oak case with bevelled glazed panels and drawer below, 14 3/4in. x 9 1/4in. x 9in. high. See illustration
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A Victorian barograph, signed on the ivorine tablet Dollond LONDON, with lacquered brass mechanism, clockwork recording drum, nickel plated diaphragm and ivory thermometer, in varnished pine case with moulded base drawer, the cover with bevelled glass lights, 22cm h. ++The exterior a little water and other stained etc but in basically good unrestored condition
A Mahogany and Lacquered Brass Barograph by Negretti & Zambra, London, with seven stage vacuum, brass cylinder with cover enclosing the clockwork mechanism, mercury thermometer, set with ink bottle and ivorine maker's tablet, enclosed by a hinged and bevel glazed four panelled cover, a graph drawer to the plinth base, 36cm
An oak cased aneroid barograph Callaghan, London, early 20th century The mechanism with concealed vacuum chamber operating inked pointer for the rotating drum lined with a paper scale, the armature signed CALLAGHAN, 23A. NEW BOND STREET, LONDON W., in a five-glass oak case with ogee base on disc feet, 37cm wide.
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