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Scientific American, Vol. 55, No. 4 (1886) (1886)
leaf 8
F _‘|Y2°T- when the analyzer is crossed. With the an- POLARISCOPE FOR EXHIBITING WIDE-ANGLED CRYSTALS. alyzer parallel with the polarizing plate, the TUBES OF POLARISCOPE, sé Boy Inventors. dark brushes are replaced by light ones. There are a good many useful inventions which are the outcome of… … ward beyond the upper lens AIRY’S SPIRALS. the ingenuity of the boy, to receive a Nicol prism, E, and also the advantage of his invention. The idea suggested by the boy’s inventive genius was put ina eg 46 ge HYDRAULIC mortar.—i of Portland cement, 2 of sand. © 1886 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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