A superb quality drum Barograph dating from the early to mid 20th Century. The barograph is cased in oak with bevelled glass and it has a drawer for storing new and used charts. 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 is gilt brass and has 11 stacked vacuum capsules and uses a gate suspension for improved sensitivity. The recording nib is on the end of a long arm which moves to record the pressure as the drum rotates.
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 nice aged patina.