SM0486
series of related mechanical movements which occur when the aneroid is subjected to
an increase or decrease in atmospheric pressures. These conditions and mechanical
movements are as follows:
(1) The partially evacuated chamber shown in Figure 17 has a thin
corrugated metallic cover which retains its shape and volume until
subjected to changes in atmospheric pressure.
(2) Arm A in Figure 17 is rigid so that slight changes in volume and shape
at P and P' can be transferred to multiplying levers connecting to B.
(3) The lever arm CB rotates about the pivot point to cause more or less
tension on the spring when arm A is moved down or up.
(4) As the tension on the spring is increased or decreased, the spindle N
turns in a counterclockwise or clockwise direction.
Figure 17.
The Aneroid Barometer
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