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On 12/20/05 8:39 AM, "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.
>
G,

The bubble chamber is located just above the body of the sextant, and at the
base of the periscope.  It has a metal knob which has the words" Turn to
increase bubble".  Hold the sextant with the knob pointing down, and turn
the knob back and forth many times to create the bubble.  If no bubble
forms, the fluid has leaked out.

If you do not have a metal knob to turn, then you do not have a bubble
chamber, and there is pendlulous mirror with crosshairs instead.
Unfortunately this requires 12 volt electrical power to illuminate for day
or night.
Ken Gebhart

   

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