The Otis King is a basic non electronic calculator with four place precision and is good enough to perform law of cosine sight reduction to 1' for celestial navigation and great circle sailing purposes. Easy to learn multiplication and division routines. Find for reasonable cost on Ebay.
http://fer3.com/arc/m2.aspx/Otis-King-Sight-Reduction-Rudzinski-oct-2017-g40309
https://www.youtube.com/watch?v=NsJtK-AVkmA&t=54s
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