NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Otis King Sight Reduction
From: Brad Morris
Date: 2017 Oct 11, 17:55 -0400
Otis King Cylindrical rules, with an effective scale length at 66 inches will certainly prove satisfactory. A nominal linear slide rule will have scales in the 10 inch range (or perhaps a pinch more given the individual rule). 6 times longer length, given the same range of numerical values, affords better resolution in the scale markings, yielding less fudging and greater accuracy.
From: Brad Morris
Date: 2017 Oct 11, 17:55 -0400
Greg
This applies to the Bygrave Cylindrical Slide Rule as well. The scale normally applied across 10 inches is wrapped around and around the cylinders, for a scale length purported to be 590 inches (15 meters). Of course, it's a special purpose slide rule, leading to spherical triangle results accurate to 1-2 arcminutes!
The Fuller Cylindrical Slide Rule is also general purpose calculator, just like the Otis King in theme, yet larger. The scale length here is purported to be 496 inches ( 12.6 meters). Call it a 50 to 1 improvement in resolution! Of course, it's a much larger device than the Otis King.
This is a "no brainer". Of course the Otis King is acceptable. I concurr! Plus, they are much more affordable to folks than either the Fuller or the Bygrave.
Brad
On Oct 11, 2017 2:07 PM, "Greg Rudzinski" <NoReply_Rudzinski@fer3.com> wrote:
The attached PDF should be helpful for those attempting to restore an older Otis King calculator.
Greg Rudzinski
Attached File:
Otis-King-Assembly.pdf
