The barograph, popular from the late Victorian period to the 1930s, is a variation of the aneroid barometer, and it records a graph of the atmospheric pressure over time using a pen or needle on graph paper, both of which are attached to a drum moved by clockwork. Due to the delicate nature of the mechanism they are usually housed in a five panel glass case, the base often fitted with drawers for storage of of new and used charts.
The barometer is an instrument for measuring atmospheric pressure. The pressure indicated can aid in predicting short term weather.
There are two main types of barometer in use, the mercury barometer, which can either be in the form of a "stick" or a "wheel", and the aneroid barometer, a later invention and most commonly available.
Italian Evangelista Torricelli, an associate of Galileo, is generally credited with inventing the mercury barometer in 1643. Galileo suggested to Evangelista Torricelli that he use mercury in his vacuum experiments.
A mercury barometer has a glass tube with a height of at least 84 cm, more...
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