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    Re: Kollsman periscopic pendulous sextant
    From: Gary LaPook
    Date: 2008 Aug 31, 21:00 -0700
    Gary LaPook wrote:

    You do not need 28 volts to illuminate the Kollsman periscopic sextants.
    All you need are a couple of Caltronics number 328 miniature lamp light
    bulbs which are the same size as the 28v bulbs originally installed in
    the sextant but which operate on 6 volts. I made up a 6 volt power pack
    for mine using 4 AA batteries which I attached to the back of the
    averager with velcro. You can also use bulbs designed for 12 volts that
    are Caltronics number 330. You could then make a power cord to use a
    cigarette lighter socket for power.

     More options Sep 6 2006, 10:07 pm

    Paul Hirose wrote:

    I have scanned the "Sextants" section of Air Force Manual 51-40, "Air
    Navigation" (1955 and 1960 editions) and posted it on my little web
    site. This is good info for owners of U.S. bubble sextant models A-10,
    A-14/AN5851-1, A-15, MA-2, and Kollsman periscopic. The MA-1 pendulous
    mirror sextant is also covered.

    The page is 990 k, but 95% of that is the images. If you have a slow
    connection, it may be best to turn off graphics in your browser, read
    the text, and individually download the images you want.


    glapook@pacbell.net wrote:
    That is exactly what is used with the A-10 sextant, 4.5 volts from
    three size "D" batteries. If you have one of the more modern Kollsman
    sextants that use an electronic averager you do need to supply 28
    volts to the averager since they won't work on less. For use in an
    airplane, you can make a 28 volt power suppy with one integrated
    circuit and a small amount of soldering. The IC converts 12 volt DC to
    28 volt DC and costs about $25.00. I made one and can find the source
    for this IC if anybody wants to do the same. You can also get 27 volts
    out of 3, 9 volt batteries wired in series. This works fine for the
    lights but the averager uses about 150 ma so these betteries don't
    last long powering up the averager. And they are expensive.
    You can also replace the 28 volt bulbs, or in your case the 3 volt
    bulbs, with 6 or 12 volt bulbs that are the same size and power them
    up with other battery combinations or with a cable to your lighter
    socket in the plane. If anybody needs the source for these other bulbs
    I can find it again. I think I posted all of this information on bulbs
    and on the IC about a year ago so you can probably search the archive
    for it also.
    On Aug 31, 6:56 am, werner <w....@gmx.net> wrote:
    Actually my Kollsmans are Euopean license builds (1 from Kollsman-
    Germany and the other 2 from Kollsman-UK, and had been used in the
    respective air forces). Those sextants have a 3 Volts lighting system.
    28 Volts only go into the gimbal aircraft mount. Within it the voltage
    is transformed into 3 Volts to go into the sextant. The usual method
    (when not installed in an aircraft) is to use a modified flashlight
    (instead of the bulb there is a connector for a cable) with 3 D-cells
    (flashlights were provided in the storing case).
    On 31 Aug., 04:49, glap...@pacbell.net wrote:
    BTW, if you need a 28 volt power supply for using your sextant at home
    just go down to Home Depot and buy a water sprinkler system electric
    transformer which puts out 28 volts and is cheap.
    On Aug 27, 12:12 pm, werner <w....@gmx.net> wrote:
    Has anyone a manual for this sextant? I need one for the "non-bubble"
    type, but with the pendulum. I have three of these sextants (two good
    ones, one needs overhaul).
    Thank you.

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