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If you have the crosshairs like Ken mentions and you can get to the light bulb 
location, you may wish to replace the 12v system with an LED and two AA 
batteries.  I did this on an A10 sextant with a dual AA battery holder, a 
pushbutton, and a red 3v LED.  It's a lot more convenient than the original 
big flashlight system.
Regards, Noell

>>> gebhart@CELESTAIRE.COM 12/20/2005 9:11:21 PM >>>
On 12/20/05 3:20 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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>
G,

OK, you certainly do have a pendulum with a mirror attached with crosshair.
I mistakenly said 12 volts was required, but as another post mentioned... It
is 28 volts DC (aircraft power).  You can either bunch a lot of batteries
together to make that potential, or maybe change the bulb to a lower
voltage.  The power goes in through a sophisticated fitting, but lacking
this, there are 2 pins visible that take the power.

Although much rarer, this pendulous mirror is actually much nicer in that
the cross hairs can be put accurately on a star without the vagaries
associated with using the center of the bubble.

Please let the list (or at least me) know how you make out with this.

Ken Gebhart

   

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