IT has become increasingly obvious that however good the thermometers may be in an aeroplane, they are liable to errors—sometimes quite large ones—as a result of vibration, fatigue or plain accidental damage. It seems quite likely that on operational machines an error, as long as it is constant, is of no great importance; as most pilots look for variations in their normal readings, rather than judge by the readings themselves, and, therefore, it is probably sufficient if any instrument that is obviously suspect is tested, and the others are‐taken as satisfactory.
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