The original file was marked Mr Wallis and titled ‘Drawing office data sheets’. Contains blueprints of specifications for materials to be used in airship construction. Includes a typed alphabetical index which lists the subject and number of each data sheet. There are 29 data sheets produced by the Airship Guarantee Co Ltd, arranged in reverse chronological order, and 72 data sheets produced by the Airship Drawing Office of Vickers Ltd, arranged in reverse chronological order. Also includes a printed pamphlet entitled ‘Vickers Duralumin – rolled and drawing sections’