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    Re: Admiral GAGO Coutinho
    From: Gary LaPook
    Date: 2010 Oct 19, 13:20 -0700

      I don't speak Portuguese but it was easy to interpret a caption at
    19:35 into the video. It quotes John Glenn as saying that on the first
    orbital flight  a modern sextant was carried that had been inspired by
    the sextant created by Admiral Cortinho for aerial navigation.
    On 10/18/2010 2:43 PM, Douglas Denny wrote:
    > Very interesting. Pity it does not have English sub-titles.
    > I have one of these sextants. They are the first successful bubble
    > sextant for aviation use. Basically a marine sextant modified with two
    > standard type of bubble spirit level tubes: one to hold the sextant
    > horizontal laterally, and the other to establish vertical.
    > The telescope is a bifocal allowing a view of the normal index and
    > horizon mirrors as normal, and the bubble arrangement at the same
    > time. Hence the telescope views at infinity for index/horizon, and a
    > few cm for the bubble at the same time. Quite simple, but ingenious.
    > There is a battery (in the handle) and lamp system to illuminate the
    > bubbles.
    > Douglas Denny.
    > Chichester. England.
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