> We have mountains around here (so AZ) that jut into the sky at 
> 7000',
> and are frequently the
> targets of climbers. A few have said that up there, in the stillness 
> of
> the top, that some hear a
> constant humming sound, similar to the TAOS HUM (gargoyle it for 
> info).


Taos Hum home page (of course)
Vast amounts of info plus links to related (and unrelated) sites

        http://amasci.com/hum/hum1.html

Good commentary
Gets a bit 'waffly' but covers the subject

        http://www.crystalinks.com/taoshum.html

Brief but useful

        http://en.wikipedia.org/wiki/Taos_Hum

Ho Hum !!!

        http://www.google.co.nz/search?hl=en&q=taos+hum&meta=



I've met the super double sized with fries version of this.
Take two diesel locomotives
At 5am ish on a winter morning place both in an engine shed and start 
their motors.
Set governors of each to exactly the same engine revs.
Natural differences will cause a beat frequency between the two 
engines.
Engine shed will sum air pressure waves and produce a high amplitude 
somewhat subsonic signal.
Whump a Whump a Whump a .....
You just TRY and sleep through that when you live perhaps 100 yards 
away :-)
We learned to after a while.


        Russell








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