An oak barograph, Negretti & Zambra, London, circa 1910,

the recording drum driven by a French timepiece movement with cylinder platform escapement, the pen controlled by a stack of eight vacuum discs and mounted with a barometer dial and thermometer on a brass bedplate, the dial signed Negretti & Zambra, London, R/4018, the moulded rectagular base with a chart drawer and hinged bevel glazed cover