This book, How To Make And Use A Telescope by Wilkins and Moore is copyrighted in 1956, and the language of that time is difficult to decipher to some extent. But, with a little effort one learns how to select and grind the right kind of glass to make a mirror for a relector telescope, and learns how to silver the glass so it will amply reflect. Some formulaes are given, like for figureing focal length by the diamater of the mirror, but if you find the math unintelligable, the explanation in English is clear enough. The kind of glass, its shape, and list of cheap chemicals needed to grind and silver the project, at a low price, are given. It took me a lot of time to find this info. Other sources mention more modern procedures that are very costly and out of reach shop-site wise for me. So basically, this, to me, is a very helpful book, and it only cost a few dollars for my used copy. It also gives a few simple, inexpensive ways of testing the quality of your work as you progress, and then tells you what adjustments to make. Not bad for the low price I paid.
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