This pre owned SB Shortland Smiths British made Barometer has a Mahogany finish.
In years gone past this specialist instrument was the main way to predict the weather for the Gardener, Grower and Farmer .
There is a overwhelming tendancy to tap the glass to get a reading but it is not advisable to  do this, as it may result in a  cracked  glass if it is continually done daily.
Complete with setting up instructions and care leaflet which includes indications of weather change guide.