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
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