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Rick,
some years ago I owned a Plath bubble horizon that I later sold on eBay.
Among my nav files I've found this instruction manual that someone emailed
me.
I'm attaching it, hope it can help you.
Federico

-----Messaggio originale-----
Da: NavList@fer3.com [mailto:NavList@fer3.com] Per conto di
Richard B. Emerson
Inviato: lunedì 11 agosto 2008 2.04
A: NavList@fer3.com
Oggetto: [NavList 6106] Re: C. PLATH BUBBLE HORIZON


Bump - I'm still looking for some help with the points raised below.

Rick Emerson
S/V One With The Wind

RBEmerson wrote:
> 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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