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In aerial navigation, there are two navigational triangles:

1. The wind triangle, solved graphically by E-6Bs, the American
Airlines Computer (that started this thread) and the back of the CB/CR
series. The Dreieckrechner (DR-2, 3, 4) used the law of sines to solve
the same. See my articles in the IM2007 proceedings.

2. The celestial triangle. The Bygrave was used to solve this using a
set of cosine/cotangent equations. See my presentation soon at the
IM2008 in the UK. Thanks for pointing me back at the Wikipedia entry:
the information there is outdated and I will update it after IM2008
(BTW the picture in Wikipedia is of the Bygrave in my collection).

Ronald

On Aug 19, 2:47 am, bruce hamilton  wrote:
> This one, The Bygrave Slide Rule, will solve the  navigation triangle.
> One of the group members has made one and was going to post the plans
> one his vacation was over. I still think this really one of the most
> ingenious devices I have ever seen. I hope to build one too.
>
> http://en.wikipedia.org/wiki/Bygrave_slide_rule
>
> Bruce Hamilton
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