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    Re: C. Plath Bubble Horizon
    From: Joel Jacobs
    Date: 2008 Jul 04, 16:56 +0000
    Hi Ken,
     
    Thanks for your input. You have discribed the difference bewteen the device I have and the earlier one correctly. It is true that the the Navy did use the C. Plath bubble horizon fitted to a sextant as a back-up system on submarines. There is an interesting section in Dutton's Seamanship & Navigation, 12th Edition,
    Article 2206, Page 385.
     
    Anyone interested in pictures and a more detailed discription should check http://landandseacollection.com/id487.html It should be marked as sold.
     
    Many thanks,
     
    Joel
    --
    Visit our website
    http://www.landandseacollection.com

     
    -------------- Original message from Ken Gebhart <GEBHART@CELESTAIRE.COM>: --------------


    >
    > 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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