Bob & Bob and/or all,

It looks to have a optical lens atop the unit, that perhaps
has "grid marks" somewhere for a value reading?  Aren't
magnetometers/gravimeters essentially (for the age of the
instrument), "simply" (likely a understatement?), a vertical
mass on a special spring?

Meredith Lamb

Hammonds wrote:

> Bob, it is indeed a Sprengnether magnetometer.
>
> Bob Hammond
> http://apsn.awcable.com
>
> At 06:08 AM 5/4/2002, you wrote:
> >Hi gang,
> >   Ebay item # 865745339 (ends 5/10) is advertised as a Sprengnether
> >seismometer.
> >I don't think that is a seismometer but may be a magnetometer or a
> >gravimeter.
> >   What is it?
> >Bob Barns
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