I have made a three minute video recording of the Hum showing clearly the 
pulse modulations. The recording is posted on YouTube at 
http://youtu.be/9eceUGRB59s

On Sunday, April 19, 2015 at 10:53:39 PM UTC+1, David Hayes wrote:
>
> Good man John. 
>
> On Sunday, 19 April 2015 07:22:08 UTC+1, John Dawes wrote:
>>
>> At times recordings of the Hum produce patterns that are remarkably 
>> stable and can last for several hours.
>> One such event I have posted here.
>> The recording was made using Audacity software on Sunday 19 April at 
>> 02.15 GMT.
>> The weather was calm with an air pressure of 1036.
>> I shall endeavour to make a video of this event to post on YouTube  
>>
>>

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