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Radio equipment constructed by prewar methods and used in areas north of Australia, where the temperature is 75 to 90 degrees Fahrenheit and the average humidity is 90 per cent, does not operate satisfactorily. Mould grows on some parts, while the insulation resistance of others is lowered to unusable values. Fungicides may be used to combat mould growth, but a variety of methods must be adopted to eliminate the effect of humidity on insulation. Methods of test for mould and humidity are dealt with.