. This being the case, our work is fairlyeasy, because we have a ready-made baseline to work from. But we must not acceptthis without first checking it, in case anydiscrepancies exist. Therefore, the longe-rons must be tested with straight-edges,each about 3 ft. long, placed at intervalson the top… … HOW AN AEROPLANE IS BUILTHaving satisfied ourselves on this point,the next thing to do is to level up accu-rately the top surface of the longerons,both longitudinally and transversely. Thismay mean packing up or lowering the tailof the machine, and then securing it firmlyin this position with…
Airplanes
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