水すい銀ぎん気き圧あつ計けい

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Meanings

1

noun

mercury barometer

A scientific instrument that measures atmospheric pressure using a column of mercury.

水water

銀silver

気spirit, mind, air

圧pressure, push, overwhelm

計plot, plan, scheme

アネロイド気き圧あつ計けい
An aneroid barometer uses a sealed metal chamber instead of mercury; more portable and common in modern consumer devices.
気き圧あつ計けい
General term for barometer; 水銀気圧計 specifies the mercury type.

Compound of 水銀 (mercury) + 気圧計 (barometer). A straightforward technical term.