Folks,

With all the talk about pendulums, it reminded me of a article I saw in a
magazine once.

The article was about a Harmonograph.

I won't even think about the math involved that would be Chris's department.

It seems to me like a mechanical pendulum adding machine.
Where the length, decay, friction.. all play a roll in drawing not a
seismogram, but a ...?

Early predecessor to the Spirograph toy??  Interesting, and not too far off
topic.

PauLC
W1VLF

http://physics.kenyon.edu/EarlyApparatus/Oscillations_and_Waves/Harmonograph
s/Harmonographs.html






Folks,
 
With=20
all the talk about pendulums, it reminded me of a article I saw in a =
magazine=20
once.
 
The=20
article was about a Harmonograph. 
 
I=20
won't even think about the math involved that would be Chris's=20
department.
 
It=20
seems to me like a mechanical pendulum adding =
machine.
Where=20
the length, decay, friction.. all play a roll in drawing not a =
seismogram, but a=20
....?
 
Early=20
predecessor to the Spirograph toy??  Interesting, and not too far =
off=20
topic.
 
PauLC
W1VLF
 
http://physics.kenyon.edu/EarlyApparatus=
/Oscillations_and_Waves/Harmonographs/Harmonographs.html