Using the Simple Hum Detector previously described and counting the number 
of pulses observed at various times of the day, a plot can be obtained 
showing the daily cycle of the Hum.
It will be found that the perceived Hum level is inversely proportional to 
the pulse count, that is, the greater the pulse rate the lower the Hum 
level..

This is best explained using the surface of a lake as an analogy. If the 
surface waves are smooth, regular and in one direction then the pulse 
number will be high and easy to define, but if the waves are erratic and 
irregular the pulse count will be low and difficult to determine.

It is at such times that the Hum produces its effects, appearing very loud 
and inducing headaches and nausea. 

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