noun
barograph
A self-recording barometer used in meteorology and aviation.
気象観測所では自記気圧計を使って気圧の変化を記録している。
At the weather station, they use a barograph to record changes in atmospheric pressure.
気圧計 is a general barometer, while 自記気圧計 specifically refers to a self-recording barograph.
Compound of 自記 (self-recording) and 気圧計 (barometer).