John, how do you know you are measuring the hum?

Can I suggest getting someone else to take the readings, and at the time the 
readings are collected, you make notes about how strongly you perceive the hum 
to be. Do this for at least 30 readings (say, one reading per day for a month), 
and then take a look at the correlation between the 2 sets of data. 

Without this kind of verification, you cannot know that you are measuring the 
hum at all.

Josh


On 12/08/2012, at 5:40 PM, "john dawes" <[email protected]> wrote:

> The measurements of Hum level posted on this site have been made as 
> individual readings and it was considered a possible improvement if readings 
> could be made continuously. A device which performs this task has been 
> constructed but so far nothing of significance has been observed.
> 
> The Hum level fluctuates in an apparently random fashion during various times 
> of the day and night. That the Hum level fluctuates is a fact and the task is 
> to find a link between these fluctuations and other phenomena either natural 
> or the result of human activity.
> 
> 
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