"And a very good result too," says the Aeroplane, complacently, as he is carefully wheeled into his shed.
That is the way Aeroplanes speak to those who love them and understand them. Lots of Pilots know all about it, and can spin you wonderful yarns, much better than this one, if you catch them in a confidential mood—on leave, for instance, and after a good dinner.
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A.M.'s: Air Mechanics.
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Butt means to thicken at the end. Screw means to machine a thread on the butt-end of the wire, and in this way the wire can make connection with the desired place by being screwed into a metal fitting, thus eliminating the disadvantage of the unsatisfactory loop.
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Deviation Curve: A curved line indicating any errors in the compass.