ING WIDE-ANGLED CRYSTALS. | between the adjacent ends of the two tubes in the uni- quartz, the beautiful spirals discovered by Airy, and BY GEO. M. HOPKINS. versal holder shown in Fig. 1. named after their discoverer, may be exhibited. These IV. The lens, B, next the object is nearly a hemisphere,… … 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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