Low frequeny impact on body

[Kalman Rubinson]

Dan and Sandra Hobson <huh at netins.net> wrote:
> Also what equipment he would use to record this phenomenon in his house.  I
> suggested a low frequency pick-up microphone, oscilloscope with
> printer...other ????

That or use a PC+soundcard with FFT software.

> He reports that he does not live near a train or airport.  Yet often if a
> glass of water is on the table there will be ripples, and other things will
> be vibrating like there is an earthquake happening...but we do not have that
> many earthquakes here in Iowa.  Other ideas that might be causing this that
> he should check out, like mining survey if house was built over old coal
> mining area?  He states when this is happening his energy is lower, he feels
> weak, and disturbs his sleep at night.  Earplugs don't seem to help.

Check the heating system.  Unbalanced blowers or pumps can throw a lot of
LF into a structure.

Kal