Catharometer made by I.C.I., Wilton, for ammonia plant, 1925-1935, and later used on early gas chromatograph. Catharometer for ammonia plant
Two small bore catharometers made by Shell Research for their early gas chromatographs, Cheshire, 1952-1955 Two small bore catharometers made by Shell Research for their early gas chromatographs 1952-1955