This is an extremely rare display barograph by Negretti and Zambra, London, with serial number R/3886 signed on the brass baseplate. It has been fitted with a highly unusual 14 day clock rotation enabling a more compact view of the daily pressure variations. The standard visible brass pressure movement has been cleaned and repolished. Special charts for this instrument have been re-printed and two years’ supply of these will be provided together with a fresh bottle of recording ink. As with all my instruments, this barograph will be professionally packed and sent via insured special post. I also have the option to use a specialist courier if required, to mainland UK addresses. Please contact me for details.
Rare Two Weekly Barograph by Negretti and Zambra