sentences:  The castle passed out of Davidson ownership in 1917 when Duncan Davidson died and left the castle to his daughter and her son, Colonel Angus Vickers, of the Vickers aircraft company.Architect Sir Robert Lorimer designed alterations in the early 1920s.After serving as the Vickers' family home for several years, and as a hospital for casualties of Dunkirk in 1940, Tulloch Castle was purchased by the local education authority in 1957.