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ANEROID CAPSULE MECHANISM

An aneroid capsule is an airtight soldered membrane box out of which the air has been evacuated. It is used to measure the absolute pressure of the air surrounding the capsule. Upon a change in pressure, the capsule is deformed and its motion is transmitted by tie-rod 2 and lever 3 to hand a, turning about a fixed axis.
$4056$EHP,M$