Figures 276 through 281 depict the catalog entries for six unannealed glasses, each a different shape, used for showing the tints of polarized light. Below, figures 283 through 290 show selenite slides with designs. The designs include a six-pointed star, shamrocks, a tulip, a thistle, a rosette, and selenite wedges. These selenite windows may have been produced by William Hill Darker (1811-1864), a commercial manufacturer of scientific instruments, specializing in microscope slides for polariscopic viewing.
Illustrations are part of Palmer's New Catalogue by Edward Palmer (1803-1872), regarded as the earliest, freely-accessible sales catalog of commercially available chemicals and scientific apparatus. The catalog provides insight into the costs and considerations of equipping laboratories during the early Victorian period. Featuring 292 engraved figures, the catalog is digitized in its entirety.
Palmer, Edward. “Figures 276-290. Unannealed Glasses and Selenite Designs for Showing the Tints of Polarized Light.” In Palmer's New Catalogue, with Three Hundred Engravings of Apparatus, Illustrative of Chemistry, Pneumatics, Frictional and Voltaic Electricity, Electro Magnetism, Optics, &c. London, England: William Gilbert, 1840. https://digital.sciencehistory.org/works/7r9fbhw.
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