A good quality Barograph by Casella dating from the mid to late 20th Century. The barograph is cased in mahogany with bevelled glass. It has a drawer for storing new and used charts and it stands on four small feet. There is a brass maker's plaque for "Casella, London. Made in England"
within the case.
The clockwork eight-day movement is housed in the drum, fitted with a seven day chart which covers one rotation of the drum. The aneroid barometer mechanism has 9 stacked vacuum capsules and utilises a gate suspension for improved sensitivity. The metal pen nib is on the end of a long arm which moves to record the pressure as the drum rotates.
It comes with a number of recording charts and it has a small ink bottle recessed into the case. New ink and charts are both readily available to buy online.
The clockwork mechanism is in good working order and the drum rotates as it should. I have not referenced the pressure readings for accuracy but I have no reason to believe it shouldn't be in working order.
It is in excellent condition for its age and has clearly been very well looked after. There are small marks here and there commensurate with age but there is no damage to report and the wood has a lovely patina.
The case measures approximately 14 1/2" (37cm) wide by 9" (23cm) deep and 9" (23cm) tall. The drum has a standard diameter of 4" (10cm).
