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are followed as in Pippard and Pritchard's Air Ministry Handbook of Strength Calculations.
Of course it is known that the more accurately the loading in flight is done, the lighter the airplane structure can be made and, as heretofore mentioned, full flight pressure zone tests have been conducted and are being employed as a guide to the attainment of a more accurate knowledge of the distribution of load and of stress. It has been found to differ quite appreciably from the model pressure tests in smaller scale. Finally, the more exact knowledge of the full size pressure distribution will certainly give more exact nature of loading a lighter structure, and give the industry more simplified assumptions which , though not strictly accurate, should in the main be accurate enough for practical use. Furthermore, the British aeronautical structural engineers are engaged in the simplification of accurate calculations for redundant aircraft structural members.

FLIGHT TESTS.
In most of the full scale flight test experimental work at the Farnsborough station, the investigators were people charged with the solution of flight test problems, actually carrying 


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