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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: recommendation for slide rule ?
From: Greg Rudzinski
Date: 2009 May 21, 17:19 -0700
From: Greg Rudzinski
Date: 2009 May 21, 17:19 -0700
Lu, One degree of error disqualifies the slide rule method. Hopefuly I can do better than that. I will be experimenting to see what my aging eyes can do. A magnifying glass might improve accuracy. I am OK with one tenth of a degree of accuracy. Greg On May 21, 3:23�pm, Lu Abelwrote: > Greg: > > Given that the K&E 4080 is an ordinary 10" slide rule, I'm afraid you'll > be disappointed. � These standard engineer's slide rules were good for > two digits of accuracy. �Even assuming you could carry that much > accuracy through the standard trig formulae for Hc, you'd still be > looking at an error of almost a degree! � �Not very good if one is > trying for minute accuracy. > > Lu Abel > > Greg Rudzinski wrote: > > Gary, > > > � � �Won a K&E 4080-3 on ebay and anxiously awaiting to receive it. > > I'm hoping that it is in good condition as described but you can never > > tell until the item is in hand. It will be interesting to compare > > solution times between the slide rule and pub 249. One advantage of > > the slide rule over pub.249 is that the dead reckoning position can be > > used as the assumed position. > > > Thanks for your advice. > > > Greg > > > On May 20, 8:51 pm, glap...@PACBELL.NET wrote: > > >> Here is a link where you can download the manual for the K&E 4080http://www.mccoys-kecatalogs.com/KEManuals/4080-3_1948/4080-3_1948.htm > > >> gl > > >> On May 20, 8:10 pm, Gary LaPook wrote: > > >>> No advantage with two sliderules. > > >>> Don't be intimidated by all the scales on these rules, most are LogLog > >>> scales that have no connection with celnav calculations. The important > >>> scales are simply the D, S, and ST scale for small angles. > > >>> gl > > >>> Greg Rudzinski wrote: > > >>>> Gary, > > >>>> � � �It does appear as you have illustrated that the K&E 4080 has > >>>> multiple advantages over the Pickett. Are there benefits to working > >>>> with two slide rules together so that products can be transfered from > >>>> one to the other and back again? If so then what types pair best? > > >>>> Greg > > >>>> On May 20, 4:05 pm, Gary LaPook wrote: > > >>>>> I like the K&E better than the Pickett because the S scale is adjacent > >>>>> to the D scale and the markings are more legible. Compare the yellow > >>>>> Pickett with the white K&E and also see my previous post. > > >>>>> gl > > >>>>> Greg Rudzinski wrote: > > >>>>>> Gary, > > >>>>>> � � �You have succeeded in getting me interested in slide rules. I > >>>>>> have never owned or used one but after some internet research I see > >>>>>> that they have been to the moon and back. Now I will have to get one! > >>>>>> So far I am leaning toward the purchase of a Pickett N3-ES which is of > >>>>>> aluminum construction. The slide rule could very well be the pinnacle > >>>>>> of low tech achievement. Right there with the mechanical chronometer. > > >>>>>> Greg > > >>>>>> On May 17, 6:21 pm, glap...@PACBELL.NET 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. > > >>>>> �IMGP5885.JPG > >>>>> 187KViewDownload > > >>>>> �IMGP5887.JPG > >>>>> 186KViewDownload > > >>>>> �IMGP5888.JPG > >>>>> 187KViewDownload > > >>>>> �IMGP5897.JPG > >>>>> 186KViewDownload --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---