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Aviation History
1942
1942 - 0638.PDF
8 Advertisements. FLIGHT MARCH 26TH, igi^ Full size section view of Spar Boom in Aluminium Alloy produced by Birmetah Ltd. CONSECUTIVE TESTS 100 consecutive tensile tests taken on an Aircraft Spar Boom—cross-section shown in silhouette—reveal the average figures as: 28-26 tons Ultimate Stress 31-7 tons Elongation % against those required by D.T.D. specification: 21-00 tons 27-0 tons 10-0% demonstrating beyond all possible doubt a material that is "better than specification." QflBsasa&as ^ * BIRMETALS LIMITED, WOODGATE WORKS, QUINTON, BIRMINGHAM, 32 BM*
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