A barograph,
by Negretti & Zambra, with clockwork recording drum, aneroid, thermometer and ink, with a pen arm stop, in a glazed mahogany case with hinged lid and drawer containing recording sheets, order forms and pen replacement instruction sheet, with spare pen -- 13¾in. (35cm.) wide
A barograph,
by Negretti & Zambra, with clockwork recording drum, aneroid, thermometer and ink, with a pen arm stop, in a glazed mahogany case with hinged lid and drawer containing recording sheets, order forms and pen replacement instruction sheet, with spare pen -- 13¾in. (35cm.) wide
