Bob, it's a strong motion accelerograph which uses film as the recording 
medium.
The unit gets triggered if the ground acceleration exceeds a set value and 
then records
the ground motion on a wide film strip.  These are still widely used but 
superceded by
digital strong motion recorders.

Bob Hammond
Public Seismic Network - Alaska
Fairbanks
http://apsn.awcable.com


At 05:09 PM 12/5/2002, you wrote:
>Hi gang,
>   Ebay offers:
>Kinemetrics SMA-1 Seismograph Event Indicator
>Item # 1923224052 ends Dec 10
>   I have no idea what this is but it looks complicated.
>Bob Barns
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