Barograph – Large Pattern Negretti & Zambra, London c.1900

This is a rare, large pattern barograph by renowned makers, Negretti & Zambra of London. Probable from a club or public school. A set of ten diaphragms operates the movement & records on to a 5” deep chart enabling the small changes in pressure to be identified. A mercury filled thermometer is fitted to the lacquered brass base. The rich oak glass case has a hinged lid & a chart drawer to the base.