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I saw this instrument in the Naval Museum in Lisbon.

gl

On 10/19/2010 1:27 PM, rcostapinto wrote:
> I'm going to try put some English sub-titles.
>
> Best regards
> Rui Miguel da Costa Pinto
>
> http://gagocoutinho.wordpress.com
>
>
>
> -----Mensagem original-----
> De: navlist-bounce@fer3.com [mailto:navlist-bounce@fer3.com] Em nome de Gary LaPook
> Enviada: terça-feira, 19 de Outubro de 2010 21:20
> Para: NavList@fer3.com
> Assunto: [NavList] Re: Admiral GAGO Coutinho
>
>
>    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.
>
> gl
>
>
> 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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