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If you can find a MA-2 on ebay I can recommend it. I purchased one
several years ago and it works fine in flight. It has the averager from
the pariscopic sextant but without the tall periscope tube, much handier
in a small cockpit. But, to keep in mind when buying on ebay, when I
received the MA-2 the pellicle was broken  making it useless.
Fortunately I was able to remove the pellicle from one of my spare parts
periscopic sextants and  used it to replace the pellicle in the MA-2. It
was like doing delicate brain surgery.

If you get a pariscopic sextant for use on the ground you can place it
on top of a tripod to make it steadier for taking the shot.

I bought an A-10A from Ken about 30 years ago and got very good results
with it in flight including transatlantic flying (before the days of
LORAN C and GPS.) It still work good and I occasionally drag it out and
take sights with it to stay in practice.

Regarding electrical power for a bubble sextant, you can replace the 28
volt bulbs with 6 volt bulbs and use 4 AA batteries in a pack to power
the lights in the periscopic and MA-2. The A-10A uses 3 D cells to power
the lights and also the averager.

Gary LaPook.

>
> Alexandre E Eremenko wrote:
>
>>
>> I was not considering a periscopic sextant yet, because
>> I thought they are too heavy (aren't they supposed to
>> be hanging on some hook in the airplane during an
>> observation?) What is the weight of your periscopic sextant?
>
>
> Periscopic sextants were designed to install in a mount in the aircraft
> ceiling. Weight is about 6 pounds, I think. That's not bad. I find the
> mental effort of a 2-minute observation worse than the physical effort!
> It requires nonstop concentration and coordination to maintain the
> correct sight picture.
>
>> That's a big problem of course. As I never held one in my
>> hands, I doubt that I can give to a seller good
>> instruction.
>
>
>
> respect.



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