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Joel,

About five years before C. Plath went out of production (say 6 years
ago?), they came out with a bubble chamber which did not have the
adjusting mechanism. As I recall, it had an internal battery, and did
not rely on the batteries in the sextant handle.  I also seem to
recall that the light had no adjustable rheostat either.  I asked
them why they omitted these desirable features.  They replied that
they were made to milspec, and that's what the specs said.  They were
very expensive too, about $1700.  I believe this is the unit you have.

Their previous adjustable bubbles were very nice, and dated nearly
back to WWII.  I don't know when they were discontinued.

Ken Gebhart
On Jun 28, 2008, at 8:09 AM, Joel Jacobs wrote:

> Hello All,
>
> Sometime ago I recall a discussion on this list about the Carl
> Plath bubble horizion. I think some participants own or have had
> experience with them.
>
> I just acquired one, and the only time I can see the bubble and the
> cross-hairs is when there is power to the unit and the internal
> illumination is on. In daylight, without power, both are invisible.
> How would you use this in daylight. It is no 2797 with a DHI date
> of 2/1/78
>
> Also, I've read that the size of the bubble can be adjusted, but
> can't find any way to do that.
>
> Any help on these and other user information will be appreciated.
>
> Many thanks,
>
> Joel
> --
>
>
>
> Visit our website
> http://www.landandseacollection.com
>


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