The attached chart shows Hum levels made on Sunday October 6. The series 1 blue graph was made at 2 .00 am when I experienced a very high level of discomfort making it impossible to sleep. The series 2 red graph was made 5 hours later at 7.00 am when the obnoxious effects had reduced considerably. The method of measurement which I have described before uses a vibrating reed and a stop watch . The vertical scale is time in seconds and the duration of the measurement was 15 minutes at 2.00 am and 15 minutes at 7.00 am.
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