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It may be that the fluid in the bubble chamber has leaked out or
evaporated; that's common in old bubble sextants.  It's hard to
imagine that the chamber itself is missing, but....

Fred

On Dec 20, 2005, at 4:20 PM, Guillaume BARTHELEMY wrote:

> Thanks for these information; As far as I can see from the drawings
> which are at
> http://www.geocities.com/petanoz/aviation/celestnav.htm, the bubble
> chamber is
> lacking on my sextant...
> But that is surprising, because on mine I wonder how the bubble
> chamber could be
> fixed,and seen from the eyepiece at that place; indeed, at that
> place there is
> only a very little hole where a very little light is screwed in.
>
> Best regards
>
> Guillaume BARTHELEMY
>
>
>
> Selon Noell Wilson :
>
>> I don't know of a manual online but there is a photo at
>> http://www.geocities.com/petanoz/aviation/celestnav.htm
>> that shows the location of the bubble chamber.
>> You may wish to search the Nav-L archives for Kollsman and for the
>> word
>> pellicle for some more information on the bubble.
>> Regards, Noell
>>
>>>>> jeanphilippeplanas@YAHOO.COM 12/20/2005 2:26:24 PM >>>
>> Hi
>>   Are you able to power the instrument with 28V?
>>   JPP
>>
>> Me Guillaume BARTHELEMY  wrote:
>>   Hi,
>> Being new borned in astronomic navigation, I bought on e-bay a
>> Kollsman
>> Periscopic sextant.
>> Unfortunately, I can't manage to see the bubble throw the
>> eyepiece. Is
>> anyone could tell me where is the bubble chamber or could help me.
>> Thanks a lot.
>> Guillaume BARTHELEMY.
>>
>>
>>
>>
>> JPP
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