Actually...........these units are antique, and rarely used anywhere anymore, as all they do
is put a needle (track) over a smoked glass curved surface and make of record of a nearby
(fairly strong) quakes gyrations.  They were very well made at the time (~late 1950's, 1960's)

However.........they DO present a possible IDEA route for a bi-directional horizontal seismometer
approach.  If I remember right; they are essentially a hanging mass (S-G = Shackleford-
Gunderson type) suspension.  It "might" be possible to derive signals with capacitance
or displacement light sensors.  Dampening could be accomodated via magnetic induction
eddy currents...say with the mass being copper, and magnets on the seismo platform
adjacent nearby.  I'am not suggesting that one buy the seismoscope and convert such;
it probably isn't worth the cost effort.

The basic idea is very old; but, no one has done such (S-G bi-directional sensing) that I'am
aware of.

"S-G's" usually have almost nill minor tilt problems compared to other "hanging gate" type
construction seismo's.  S-G's need a sturdy frame support mechanism/assembly.
Obviously they are a "gravity zeroing" instrument.

The hanging mass "natural period" will be short in itself; but, with a displacement sensor/s,
one should see the "L" phase (somewhat attenuated) longer quake periods results readily. 

One might need a unspecified thickness of the mass hanging wire; to limit any (air current)
mass rotation that could occur with too thin a diameter of smaller gauge wire.   

Take care, Meredith Lamb

----- Original Message ----- 
From: Edward Ianni 
To: psn-l@..............
Sent: 12/2/2004 7:24:49 PM 
Subject: [Norton AntiSpam] Seismoscope


Hi Gang;
     Seismoscope on ebay.....6128658309.






Actually...........these units are antique, and rarely used anywhere anymore, as all they do
is put a needle (track) over a smoked glass curved surface and make of record of a nearby
(fairly strong) quakes gyrations.  They were very well made at the time (~late 1950's, 1960's)
 
However.........they DO present a possible IDEA route for a bi-directional horizontal seismometer
approach.  If I remember right; they are essentially a hanging mass (S-G = Shackleford-
Gunderson type) suspension.  It "might" be possible to derive signals with capacitance
or displacement light sensors.  Dampening could be accomodated via magnetic induction
eddy currents...say with the mass being copper, and magnets on the seismo platform
adjacent nearby.  I'am not suggesting that one buy the seismoscope and convert such;
it probably isn't worth the cost effort.
 
The basic idea is very old; but, no one has done such (S-G bi-directional sensing) that I'am
aware of.
 
"S-G's" usually have almost nill minor tilt problems compared to other "hanging gate" type
construction seismo's.  S-G's need a sturdy frame support mechanism/assembly.
Obviously they are a "gravity zeroing" instrument.
 
The hanging mass "natural period" will be short in itself; but, with a displacement sensor/s,
one should see the "L" phase (somewhat attenuated) longer quake periods results readily. 
 
One might need a unspecified thickness of the mass hanging wire; to limit any (air current)
mass rotation that could occur with too thin a diameter of smaller gauge wire.   
 
Take care, Meredith Lamb
 
----- Original Message ----- 

From: Edward Ianni 
To: psn-l@..............
Sent: 12/2/2004 7:24:49 PM 
Subject: [Norton AntiSpam] Seismoscope


Hi Gang;
     Seismoscope on ebay.....6128658309.