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I like the K&E 4080 because the trig scales are marked in degrees and
minutes so use the same units as other methods of celnav. The 4081 is
almost identical except the scales are marked in degrees and tenths of
degrees. Take your pick.
PS. they are things of beauty.

gl

On May 16, 10:16�am, corallina  wrote:
> Awhile back some pdf files were posted containing a bygrave
> type computer. �I believe it was the original poster did a
> comparison using his keuffel and esser 4080 slide rule against
> the bygrave and perhaps a calculator.
>
> Now I am interested in trying a slide rule. �It would seem that
> ebay has the most to offer and I have checked prices for
> the one mentioned above. � At this time I am only interested in
> using the slide rule for sight reduction.
>
> Being rather ignorant of slide rules I would appreciate if there are
> other models that the list would recommend giving me a few
> more options before purchase.
>
> Thank you.
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