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I can't think of any advantage to having S and T scale on the body in
addition on the slide for the normal method of calculating Hc and Az.
The pictures I found on line appears to show that the rules lack the
ST scale so don't cover small angles which could cause problems..

gl

On May 21, 6:28�am,  wrote:
> Gary,
>
> British brand UNIQUE offered several sliderules of cheap construction, but
> interesting scale layouts. Among them was so called "Unqiue navigational". In
> addition to normal log scales it featured sine and tangent scales located both
> on slide rule body AND slide. Allegedly this would make certain trig
> calculations easy.
>
> Whould it be more convenient to calculate a celestial fix with this layout? 
If not, what other navigational calculations would be simplified?
>
> Unique Navigational may be seen on various places on the internet, for example
> here:http://www.mathsinstruments.me.uk/page14.html
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