Multi-range zero wet air Katharometer (Godart Katapherometer), by Cambridge Instrument Co. Ltd, 1964, used to analyse quantity of exhaled helium in vital capacity tests of the lungs (used with `bag inn box' 1979-209) at London School of Hygiene, 1964-1978 Multi-range zero wet air Katharometer (Godart Katapherometer) 1964
Infra Red Carbon Monoxide analyzer, by Infra Red Development Co., Welwyn, exhaled carbon monoxide in vital capacity tests of the lungs (used with `bag in box' 1979-209) at London School of Hygiene, 1960-1978 Infra Red Carbon Monoxide analyzer 1960-1970