SOLVED: The image illustrates a simple barometer consisting of a glass tube sitting in an open dish of mercury: The height of the mercury in the glass tube is proportional to atmospheric
Mercury Barometer by Science Photo Library
Barometer Tube, 35 Inch - With Bulb - Used To Measure Air Pressure - Borosilicate 3.3 Glass - Eisco Labs - Walmart.com
Barometer Signed Jecker, Paris 1800 For Sale at 1stDibs