PSN-L Email List Message

Subject: Re: seismograph item?
From: hammond hammond@...........
Date: Thu, 05 Dec 2002 18:39:51 -0900

Bob, it's a strong motion accelerograph which uses film as the recording 
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superceded by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

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
>Public Seismic Network Mailing List (PSN-L)
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