an analogous machine (70's)

In the 70's there was an analog dive computer available: Gehaeuse = housing, Druckmesser = pressure gauge (bourdon type),

PVC Balg = plastic bag, Keramikfilter = sinter filter, N2 = nitrogen gas

the ambient pressure through diving forced the nitrogen gas in the little plastic bag through the filter into the pressure gauge, thus moving the pointer.

The filter thus simulates the half-time of one compartment via it's resistance to the gas-flow.

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