eir discoverer, may be exhibited. These IV. The lens, B, next the object is nearly a hemisphere, spirals are shown in Fig. 6. In Fig. 7 is shown the figure produced by the inter- position of a quarter wave mica film between the pol- (periscopic) spectacle lens of 3 in. focus, arizer and a plate of… … LONGITUDINAL SECTION oF _‘|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…
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