NavList:

Thank you all for your great help.

I will try to power the sextant (maybe 24v would work?) or to change the lights (there seems to be twice) with 3 or 4,5v leds.
There is another thing which I don't understand; there is a "metal tube"  intended to receive 3 batteries LR20 D which is connected under sextant. I tried to connect it but without any result. I suppose that the 28v supply is also to be made on this connection.

Best regards
Guillaume



Noell Wilson a écrit :

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" <barthelemyavocat@FREE.FR>
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 <NOELL_WILSON@SOUTHWIRE.COM>:

    

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 <barthelemyavocat@FREE.FR> 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