Hi Folks, Sometime in the past I saw a web site describing different =
type of pendulums used in sensors.  I don't remember their names, but

1.  one was a long vertical rod, with a center pivot, it contained a =
mass at the top of the rod and a mass at the bottom of the rod.


2. Another pendulum was a horz rod which had a short vertical rod =
pointing up from the center of the long horz rod.  The pivot point was =
at the top of this short vertical.

There may have been two or so more pendulum illustrated.

My question has to do with 1.  I thought this pendulum (positioned like =
an airplane propeller) was able to adjust it's period by moving the top =
and or bottom mass, up or down the rod?
I made a simply mock up of this illustration, but was not successful in =
any way as the mock up was too crude.  To me it was similar to the =
folded pendulum, as it had a normal and inverted pendulum, one apposing =
the other?
Can one adjust this arrangement to result in an extended period????????  =
 Does anyone know of this wed site or one similar?








Hi Folks, Sometime in the past I saw a =
web site=20
describing different type of pendulums used in sensors.  I don't =
remember=20
their names, but
 
1.  one was a long vertical =
rod, with a=20
center pivot, it contained a mass at the top of the rod and a mass at =
the bottom=20
of the rod.
 
 
2. Another pendulum was a horz rod =
which had a=20
short vertical rod pointing up from the center of the long horz =
rod.  The=20
pivot point was at the top of this short vertical.
 
There may have been two or so more =
pendulum=20
illustrated.
 
My question has to do with 1.  I =
thought this=20
pendulum (positioned like an airplane propeller) was able to adjust it's =
period=20
by moving the top and or bottom mass, up or down the rod?
I made a simply mock up of this =
illustration, but=20
was not successful in any way as the mock up was too crude.  To me =
it was=20
similar to the folded pendulum, as it had a normal and inverted =
pendulum, one=20
apposing the other?
Can one adjust this arrangement to =
result in an=20
extended period????????   Does anyone know of this wed site or =
one=20
similar?
 
Thanks, Ted