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    Re: C. Plath Bubble Horizon
    From: Ken Gebhart
    Date: 2008 Jul 3, 16:24 -0500

    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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