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    Re: Advice on Box Sextant
    From: Francis Upchurch
    Date: 2016 Apr 1, 23:28 -0700

    Thanks Hewitt,

    yes, that is how I  read it. For my Astra B I have to remove the telescope to stow in the box. Don't know about other makes.

    Reading the Tasman book, it sounds as if he first learnt Cel Nav in New Zealand a few months  before the flight in 1931. He first used a Booth Bubble, but reverted to an "ordinary sextant" and low flying for natural horizon shots.

    I wonder what would have been the typical "ordinary sextant" available in New Zealand in 1931? 

    I've just re-read the Arthur Hughes History of Air Navigation chapter on this and he does indeed mention "a marine box sextant" . So the plot thickens! In Chichester's  4 wartime cel nav teaching books, there is no mention of a box sextant, but book 4 has a page on an "Airship sextant" , which looks just like a good marine sextant with micrometer.

    The question is , did he box or not?

    Francis

       
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