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The bell housing with the paper recording revolved electrically or was driven by a windup mechanism. Working on the assumption that loss of volume of air in the bell housingĬorrelated directly with the volume of CO 2 exhaled and absorbed. A CO 2Ībsorber could be placed in the bell housing and used in experiments to determine O 2 consumption, Pulleys attach the canister bell to a pen which records volumes on paper on the outside of the canister.

The volumes and capacities listed here are normally determined using a spirometer! A traditional "bell spirometer" is a canister of water with an inverted canister bell over it with air space inside the invertedĬanister bell.