This slide rule is for calculating the aspect ratio (ratio of wire diameter to ring diameter) of the links used in making chain maille - another of my many, many hobbies. I've posted this on the Maille Artisan International League website here, where it can be downloaded, printed, and made. I gave the original back to my wife - this is a 1/2 scale version I made by reducing the original on a photocopier. It works just like the original does, only it fits in my pocket. The Log Log Duplex Decitrig by Lyman M.Something like "?evett" written on the cover, but I can't quite make it out. This book came with a Keuffel & Esser N4053-2 (labeled "R. Quick and Easy Lawrence Slide Rule Instruction Book, Lawrence Engineering Service, Peru, Indiana, ©1939, 1940.How to Use Log Log Slide Rules by Maurice L.Speed and Fun with Figures: Three Books in One, D.The Slide Rule and How To Use It by Hobart H.Chainmaille aspect ratio calculator how to# This book includes a Lawrence model 10-B with a magnifying cursor. These are slide rules or adding machines I don't have, but wish I did. Y'know, just in case Santa Claus stumbles across this site. These images were stolen without remorse from eBay. The Curta is a very cool machine, designed by Curt Herzstark while incarcerated in a Nazi concentration camp! This amazing little machine can add, subtract, divide, multiply, fit in your pocket, grind pepper, predict the weather, and unlike those boring electronic calculators, the Curta has ten billion moving parts! If they're yours and you want me to remove them, contact me and I will be happy to accomodate you. The advantage of a cylindrical (actually helical) rule is the great scale length, and the precision that goes with it, in a small package. Chainmaille aspect ratio calculator plus#.Chainmaille aspect ratio calculator how to#.
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