Davis was the author of several manuals on diving including

SUBJECT AREA: Ports and shipping

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Davis was the son of a detective with the City of London police. At the age of 11 he entered the employment of Siebe, Gorman \& Co., manufacturers of diving and other safety equipment since 1819, at their Lambeth works. By good fortune, his neat handwriting attracted the notice of Mr Gorman and he was transferred to work in the office. He studied hard after working hours and rose steadily in the firm. In his twenties he was promoted to Assistant Manager, then General Manager, Managing Director and finally Governing Director. He retired in 1960, having been made Life President the previous year, and continued to attend the office regularly until May 1964.

Davis's entire career was devoted to research and development in the firm's special field. In 1906 he perfected the first practicable oxygen-breathing apparatus for use in mine rescue; it was widely adopted and with modifications was still in use in the 1990s. With Professor Leonard Hill he designed a deep-sea diving-bell incorporating a decompression chamber. He also invented an oxygen-breathing apparatus and heated apparel for airmen flying at high altitudes.

Immediately after the first German gas attacks on the Western Front in April 1915, Davis devised a respirator, known as the stocking skene or veil mask. He quickly organized the mass manufacture of this device, roping in members of his family and placing the work in the homes of Lambeth: within 48 hours the first consignment was being sent off to France.

He was a member of the Admiralty Deep Sea Diving Committee, which in 1933 completed tables for the safe ascent of divers with oxygen from a depth of 300 ft (91 m). They were compiled by Davis in conjunction with Professors J.B.S.Haldane and Leonard Hill and Captain G.C.Damant, the Royal Navy's leading diving expert. With revisions these tables have been used by the Navy ever since. Davis's best-known invention was first used in 1929: the Davis Submarine Escape Apparatus. It became standard equipment on submarines until it was replaced by the Built-in Breathing System, which the firm began manufacturing in 1951.

The firm's works were bombed during the Second World War and were re-established at Chessington, Surrey. The extensive research facilities there were placed at the disposal of the Royal Navy and the Admiralty Experimental Diving Unit. Davis worked with Haldane and Hill on problems of the underwater physiology of working divers. A number of inventions issued from Chessington, such as the human torpedo, midget submarine and human minesweeper. In the early 1950s the firm helped to pioneer the use of underwater television to investigate the sinking of the submarine Affray and the crashed Comet jet airliners.

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