noun
microbarograph
A meteorological instrument that automatically records very small changes in atmospheric pressure.
自記微圧計は、気圧の微細な変動を連続的に記録する装置です。
A microbarograph is a device that continuously records minute fluctuations in atmospheric pressure.
気圧計 is a general barometer, while 自記微圧計 specifically records very small pressure changes automatically.
Compound of 自記 (self-recording), 微 (minute), and 圧計 (pressure gauge). The exact historical derivation is uncertain; the term is a technical coinage for a specialized meteorological instrument.