his is a good quality barograph, almost certainly made by Short & Mason of London for retailing in the UK by an optician, circa 1930. The polished golden oak case has a lift-off lid with bevelled glass. There is a chart drawer to the base.
This particular instrument was being tested by me (in the UK) and checked (clock, pen nib, ink etc.) at the time of the volcanic eruption in the South Pacific in January this year and the spike, together with the aftershock some hours later, can clearly be seen recorded on the chart.
362mm wide x 205mm high x 220mm deep.
A selection of charts, millibars/inches included together with a fresh bottle of recording ink and copies of operating instructions.