Early 20th Century Barograph of the highest quality. The Barograph is cased in Mahogany and bevelled glass, with a sectional drawer to hold new charts and used charts. The workings are lacquered brass and the mechanical eight-day clock movement is housed in the drum, fitted with a seven day chart which covers one rotation of the drum.The aneroid barometer mechanism has 8 stacked vacuum capsules and utilises a gate suspension for improved sensitivity. The nib is on the end of a long arm which is what moves to record the pressure.
It comes with a massive amount of new charts, at least a year's worth if not more and a number of used charts. It has its original glass ink bottle fitted into a holder. It comes with the original setting up instructions and details of how to interpret readings.
The case measures approximately 14 1/2" wide by 9" deep and 9" tall. The drum has a diameter of 4" (10cm).
The clockwork mechanism is in working order and has a healthy tick. I have not referenced the readings against a chart for accuracy but I believe it to be in working order. It will however of course need calibrating and setting up to the correct pressure when it arrives with you.
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 patina.
The best description I can give comes from the photos so please look at them all carefully and if you have any questions at all please ask.