Barometer Fortin's, Brass, Borosilicate with Thermometer

Fortin's barometer is a precision instrument used to measure atmospheric pressure. It typically features a mercury column enclosed in a borosilicate glass tube, mounted on a brass frame for durability and aesthetic appeal. The barometer includes a built-in thermometer to measure temperature, which is essential for accurate pressure readings as mercury expands with temperature changes. The device has a scale for reading the height of the mercury column, and an adjustable cistern to calibrate the mercury level. This combination of materials and features makes Fortin's barometer highly reliable for scientific and meteorological purposes.