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PRISM entries in Index to How To Do It Information
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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION.
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PRISM
xx   OPTICS

Fabricate a thin prism (from glass plates and clear casting resin) which is placed in front of a finderscope and makes Polaris appear to lie exactly at the north celestial pole.
SKY & TELESCOPE Apr 1997 (v.93#4) pg. 86