The attached chart shows Hum level readings made on Monday November 25 and on Monday December 23. The November chart shown in black was taken when the air pressure was very high and the readings were comparatively stable. The December chart shown in red was taken when the air pressure was very low with gale force winds and heavy rain. The Hum levels were very erratic making it necessary to make several readings and take the mean average. All readings plotted are at one hour intervals from 6 am to 11pm.
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