A sectioned water depression flowmeter apparatus on a tall metal stand with castors. There are three knobs on the camera-facing side of the apparatus: one black, one yellow, and one blue, which correspond to oxygen, propylene, and nitrous oxide respectively. Two gas canister lids attached to the apparatus with long metal ball chains read "AUSTOX/OPEN SLOWLY". Above the knobs is a set of glass tubes, that have had a metal panel between them cut out. Part of the valve on the left below the knobs has been sectioned away to show the spring mechanism inside.nitrous oxide, oxygen, propylene, hospital, anaesthesia