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Is it possible using a slide rule to compute say Hc
without writing down intermediate results?
What would the steps be?

With azimuth and the subtraction, I suppose it
would be necessary to resort to paper for the
final calculation?


On Sun, May 17, 2009 at 6:21 PM,   wrote:
>
> 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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