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    Re: C. Plath Bubble Horizon
    From: R B Emerson
    Date: 2008 Jul 30, 10:27 -0700

    I'd like to branch this topic and ask about the older "full monty"
    Plath bubble horizon.  I have one and I've got some questions about
    it.
    
    First, the rubber around the eyepiece (call it an eyecup, I guess) is
    basically on its way out (dried out and crumbling along a part of the
    edge) - can anyone recommend a reasonable (good fit and costs less
    than a new sextant ;-) ) replacement?  Second, except with the solar
    filter over the objective, the bubble is simply too dim to be seen
    when shining a bright LED flashlight down through the opening for the
    bulb.  Even then, the image is very dim.  Advice on living with the
    bubble horizon, in general, is welcome (anyone got a PDF of the
    instructions?).  (The battery compartment in my Plath still needs
    help, thanks to a less than attentive prior owner - hence the test
    with a flashlight)
    
    I bought the unit as part of a sextant sold on eBay some time ago
    (well over 5 years ago at least).  In retrospect, this may have been
    something of a con job gone wrong as the sextant may well have been
    the Soviet SNO/CHO clone, sold as a Plath (what did I know?), but the
    bubble horizon is a for-real Plath horizon, bought for peanuts (I sold
    the sextant and the buyer didn't gripe - no hurt, no foul, I guess).
    
    
    On Jul 3, 5:24 pm, Ken Gebhart  wrote:
    > Joel,
    >
    > About five years before C. Plath went out of production (say 6 years
    > ago?), they came out with abubblechamber 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
    >[...]
    
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