A lovely innovative design by Casella, London and one of the last produced by this long-established company. Initially developed for the larger, open scale barograph, the movement is of the ‘Jib’ crane style and has proved to be extremely accurate and sensitive to small pressure movements. With a substantial cast alloy base in a white stove enamel finish and  acrylic lift-off lid the instrument would be perfect in a modern office or domestic environment.
2 years supply of monthly charts is included together with
a fresh bottle of special blue recording ink and a reprinted
pamphlet by Negretti & Zambra describing operating
instructions and how to interpret typical chart recordings.
295mm wide x 153mm deep x 174mm high.