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I have been looking for one of these for 20 years. No luck so far. I know
the man who helped to developed it and had the pleasure of handling the
original prototype in 1990.

The twilight computer is discussed in a publication called: "Arctic Air
Navigation" by Cmdr. K.R. Greenaway.

Attached, are some photos from the book.

Robert

----- Original Message -----
From: 
To: 
Sent: Friday, May 29, 2009 4:51 PM
Subject: [NavList 8445] twilight computer


>
> Try google patent for this twilight computer:
>
> Patent number: 2633295
>
> Problem is in northern latitudes it is possible that a whole flight may be
> in twilight, when neither sun nor stars can be observed.  Good to plan
> around this.
>
> I've been looking for one of these.  Anyone got one?
>
>
> >
>

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