Siphon barometer

a barometer having a tube bent like a hook with the longer leg closed at the top. The height of the mercury in the longer leg shows the pressure of the atmosphere.

See under Barometer.

siphon barometer

[′sī·fən bə′räm·əd·ər] (engineering) A J-shaped mercury barometer in which the stem of the J is capped and the cusp is open to the atmosphere.

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