Meredith Lamb or any member using a Sprengnether 201 Long Period unit: =
There is an scale on the front of mine with the indicator pointer that =
is at the fourth line from the top, which is essentially at the top =
stop, and will normally oscillate to the 6th line from the top. Is this =
where it is supposed to be or should it be centered on the 20 unit scale =
which after a year of off and on fiddling seems impossible?
James Allen =20
----- Original Message -----=20
From: meredith lamb=20
To: psn-l@.................
Sent: Wednesday, August 13, 2008 9:35 AM
Subject: Re: Concerning "A vertical and horizontal sensing pendulum"
Randall,
Per the email below; you are absolutely correct; it doesn't have a =
vertical component. Just by my putting a finger
on the mass (which is what I should have originally checked); there =
isn't any sensed vertical motion whatsoever. I will
eventually change the web page to reflect such correction.
Mental logic says it yet still quite possible to actually make it =
specifically vertical sensitive, by perhaps adding either a pivot area
metal extension and a adjustable spring which extents perhaps to the =
base area or thereabouts; which forces a vertical
component into the picture.
The horizontal sensing motion "seems" noteably enhanced (~1/2 hour =
longer than any other tested S-G pivot setup) by the
offset pivot....i.e., via my simple amateur friction mass offset time =
duration test. With your background; I suspect you may
have indeed already tried such...what's your simplified opinion on =
that pivot approach....I'am quite "open" on that subject too.
It does seem to have a very responsive visual pendulum offset to even =
very the slightest air currents when not shielded/enclosed.
Its a novel S-G pivot (simple gravity pendulum) setup yes; but still =
interesting where it might be possible to use either
a added spring maintained vertical, or, the as is, horizontal sensing; =
but likely not both at the same time.
Take care, Meredith =20
=20
On Wed, Aug 13, 2008 at 6:28 AM, Randall Peters =
wrote:
Meredith,
I am trying to understand the vertical response that you mention =
for
the system described at http://seismometer.googlepages.com/vh
With the pendulum hanging initially at equilibrium (center of mass
directly below the center of the ruby spheres) I can't envision any
physical mechanism for which a strictly vertical acceleration is =
capable
of producing motion.
Randall
Meredith Lamb or any member using a =
Sprengnether=20
201 Long Period unit: There is an scale on the front of mine =
with the=20
indicator pointer that is at the fourth line from the top, which is =
essentially at the top stop, and will normally oscillate to the 6th =
line=20
from the top. Is this where it is supposed to be or should it be =
centered=20
on the 20 unit scale which after a year of off and on =
fiddling seems=20
impossible?
James Allen
----- Original Message -----
From:=20
meredith lamb
Sent: Wednesday, August 13, =
2008 9:35=20
AM
Subject: Re: Concerning "A =
vertical and=20
horizontal sensing pendulum"
Randall,
Per the email below; you are absolutely correct; it doesn't have =
a=20
vertical component. Just by my putting a finger
on the mass (which is what I should have originally checked); =
there isn't=20
any sensed vertical motion whatsoever. I will
eventually change the web page to reflect such correction.
Mental logic says it yet still quite possible to actually make it =
specifically vertical sensitive, by perhaps adding either a pivot =
area
metal extension and a adjustable spring which extents perhaps to =
the base=20
area or thereabouts; which forces a vertical
component into the picture.
The horizontal sensing motion "seems" noteably enhanced =
(~1/2 hour=20
longer than any other tested S-G pivot setup) by the
offset pivot....i.e., via my simple amateur friction mass offset =
time=20
duration test. With your background; I suspect you =
may
have indeed already tried such...what's your simplified opinion =
on that=20
pivot approach....I'am quite "open" on that subject too.
It does seem to have a very responsive visual=20
pendulum offset to even very the slightest air currents when not=20
shielded/enclosed.
Its a novel S-G pivot (simple gravity pendulum) setup yes; but =
still=20
interesting where it might be possible to use either
a added spring maintained vertical, or, the as is, horizontal =
sensing;=20
but likely not both at the same time.
Take care, Meredith
On Wed, Aug 13, 2008 at 6:28 AM, Randall =
Peters <PETERS_RD@..........> =
wrote:
Meredith,
=20
I am trying to understand the vertical response that you =
mention=20
for
the system described at http://seismometer.googlepages.com/vh
With =
the pendulum=20
hanging initially at equilibrium (center of mass
directly below =
the=20
center of the ruby spheres) I can't envision any
physical =
mechanism for=20
which a strictly vertical acceleration is capable
of producing=20
motion.
=20
=
Randall