Aneroid Barograph.
Uses a small, flexible metal box called "aneroid cell" which is sealed after some of the air is removed, so that small changes in external air pressure cause the cell to expand or contract.
The registering aneroid barograph consists of a revolving drum on which the air pressure is recorded, a syphon cell that expands or contracts as air pressure rises and falls, and a lever that transfers the movement of the syphon cell to the recording pen that writes on the revolving drum.
Found in weather stations because it provides a permanent record of pressure readings and on ships befaure the wireless weather forecast.