A quite unusual barograph engraved on the base by renowned makers Negretti & Zambra, circa 1950. The lovely deep gold colour lacquered movement consists of four large sets of spun diaphragms mounted on an ebonized brass baseplate. There are two rare features with this instrument – firstly, there is a removeable aluminium plate mounted on top of the central crossbar which describes all the weather predictions, normally seen on ‘Stormoguide’ barographs by associate company, Short & Mason and secondly, the highly unusual altitude adjustment feature at the right-hand end of the pen arm. I’ve seen many hundreds of barographs in my lifetime and this is the only arrangement I have seen for adjusting the pen arm. It does not appear in any of Negretti’s trade catalogues, despite its simple operation. I would guess it was an experimental feature. The Oak case has a five-glass lift off lid. A quantity of charts and a fresh bottle of recording ink will be included.
333 wide x 165mm high x 190mm deep.