Mercury Barometers
![two mercury barometers used from 1854-1881](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/NMAH-73-5069.mercury%20barometers.NWS_.jpg?itok=NIjGSZG2)
Detailed Description
Mercury barometers, which measure atmospheric pressure, were used in the 19th century to calculate elevation above sea level; this photograph depicts an Adie mercury barometer, c. 1854-1881
Sources/Usage
Source: National Museum of American History, originally from the National Weather Service