With some exceptions, the wrought, as distinct from the cast, Hiduminium - RR. alloys owe their origon to the classical research work on aluminium alloys at the N.P.L. during the First World War. The founding of High Duty Alloys Ltd. in 1928 led to a technical liaison between this firm and the major aero-engine and aircraft companies, which resulted in the development of a series of wrought and cast aluminium alloys designed to meet the specific requirements of designers and manufacturers in these particular fields.