The Cavendish was been designed in collaboration with many of the leading anaesthetists of Great Britain as a comprehensive unit to meet every requirement for general inhalation anaesthesia. The aim was to produce an apparatus with easily accessible controls, of simple design and robust construction, which gave long and trouble-free service in the busy theatres of large hospitals. Many of the individual components already proved their worth; as one example, the 'Lincoln 800' Closed Circuit Unit - a unit of advanced design with transparent Soda Lime Canister and Emergency Oxygen Flush Control. The accuracy and reliability of Rotameters have been proved during many years' use- MIE Individually Calibrated Rotameters were fitted as standard equipment.