At 07:28 PM 2/28/02 -0700, you wrote:
>Hi Bob and all,
>
>If it has a drum and a pen - it's a seismograph - right???
>Raul Alvarez

Not necessiarly....   many of  the older analog barometers were  drum and 
paper units     i used  to fondly admire  the one  at my local airport met 
office when i was a young kid

cheers
Dave



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