16 page Airship Guarantee Co Ltd report entitled 'Dominion Type Airship Mooring Mast', written by Barnes Wallis. Includes a photograph of actual girder construction and diagrams for loads showing wind pressure and ship handling in. The report includes a two page descriptive statement signed by B N Wallis, Chief Engineer, Airship Guarantee Co Ltd, Howden Airship Station, Yorks on 10 September 1926.
The report is housed in its original file, which is marked 'Strictly Confidential' and was witnessed and signed by a Commissioner for Oaths on 11 September 1926
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