NavList:

Another thought: in continuation of the scale length issue of the Bygrave Slide Rule I have raised.

The Log CoTangent scale is of course asymptotic at both ends where the degrees are approaching less than one towards zero; and at 89 degrees approaching 90; so the "full" scale length cannot be easily defined as they would become infinitely long.
The LogCos scale is similarly afflicted at the top end approaching 90 degrees; and is crowded at zero.

Hence 'scale lengths' become meaningless as one approaches the limits of the scales. In practical terms I suspect the slightly different diameters between the tubes and their scales does not affect accuracy significantly if made to the same or very similar scale factor because of the very log scale length - as I mentioned before in the previous posting.

Douglas denny.
Chichester. England.

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