Bottom line is ; he is indirectly measuring the moment applied to the
device by his hands (:

Crystal inside is a piezoelectric crystal and when stress is applied across
boundries of the structure there is a potential fluctuation across the
vertical axis or vice versa. What is being 'displayed' is a the
differential change in the clock of the frequency meter actually.

There is no such concept as 'gravity field' as the video states and bunch
of other crap mentioned. There are gravitational waves and you need
something like a LIGO to measure that. It's 'possible' to see them in a lab
on Earth as well but this requires very special hardware, for example me.


On Tue, Aug 5, 2014 at 11:21 AM, <jim@jpes.com> wrote:

>
>  Just an FYI, if you're measuring "weight", that certainly does have
> something to do with gravity.
>  What we call weight is the reaction our mass has in relation to
> gravity.  For instance, if one
>  weighed say 100 pounds on earth, that same person would only weigh
> about 11 pounds on the moon
>  because the moons gravity is about 1/9th that of the earth.
>
>  Regards,
>
>  Jim
>
> > -------- Original Message --------
> > Subject: Re: [EE] Dave on Gravity
> > From: Peter <plpeter2006@yahoo.com>
> > Date: Tue, August 05, 2014 7:25 am
> > To: piclist@mit.edu
> >
> >
> > Sergey Dryga <sergey <at> dryga.us> writes:
> > > Without knowing the details of the crystal configuration, the effect
> seems
> > > feasible enough.
> >
> > Gravity vector *orientation* caused crystal frequency changes are well
> > documented by makers. Technically one is weighing the crystal in variou=
s
> > configurations and not measuring "gravity" at all. I think that mr
> eevblog
> > should have mentioned the need to use at least a Rubidium clock as
> counter
> > reference when doing what he did. He must have started some new movemen=
t
> > among the masses with that blog (which I did not watch). All clocks and
> > watches also undergo the 2g "tipover" test for certification, among oth=
er
> > things. Also some of the effects CAN be seen on decent equipment. Here'=
s
> a
> > writeup by Brooke Clarke who used to be on this list too:
> >
> > http://www.pacificsites.com/~brooke/I/timefreq.shtml
> >
> > (search for 'gravity' in that)
> >
> > -- Peter
> >
> > --
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