The barometer measures air pressure. A local fall in air pressure can indicate the approach of a frontal system with associated bad weather.
Pre-RoF Baroscopes. While the down-timers do not have barometers, they do have a baroscope (which shows pressure change without quantifying it). The earliest form was actually Drebbel's perpetuum mobile; it featured a glass tube half-filled with water, partitioned at the top with one side communicating . . .
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- The Grantville Gazette Staff