The Probert Encyclopaedia of Science & Technology

CISTERN BAROMETER

A cistern barometer was a common 19th century form of barometer consisting essentially of a straight glass tube about thirty-three inches long, filled with mercury, and dipping into a cistern of the same metal. The tube was affixed to a mahogany stand, on the upper part of which was a graduated scale to mark the height in inches at which the mercury stands.
Research Cistern Barometer