Terry Koken made his first telescope mirror over seventy years ago. An Evolute Tester for Optical Surfaces A Manual of Theory, Construction & Programming By Terrell E. Koken 8.5 x 14 EBook 680 Pages - 166 Illustrations 15 Appendicies -A new, patented optical tester is presented  and thoroughly described. It permits  testing  concave, convex, flat, and non-conic  surfaces  to unprecedented accuracy without the  production or use of any other optical  surface. ISBN: 978-0971001-26-8 -- The Complete 2-Volume Ebook -- EBook $40.00 -- Instant Book Buy * --

 This book is the product of eighteen years’ work on the theory and mathematics of conic sections and the testing of optical surfaces. A new, patented optical tester is presented and thoroughly described. It permits testing concave, convex, flat, and non-conic surfaces to unprecedented accuracy without the production or use of any other optical surface.
 The method of testing uses a computer to automate it, and a precision stand for the optic under test, so that tests may be precisely repeated.
 All the mathematical derivations are done with a computer-algebra system, and are maintained in a second, independent volume of appendices that makes it easy for the mathematically-inclined to follow the author’s derivations.
 Such derivations are not done for their own sake, but for the purpose of making pictures, or animations, that illustrate the principles. For reference, the patent and a seminal article on testing optics are both included in these appendices.
 The second volume is not printed, but carried as an adjunct .PDF file, available for download. The Windows C code that generates animations is available for download as source or executable modules.

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