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Wallace Replica Grating-3 Optical Diffraction slides Central Scientific Company For Sale
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Wallace Replica Grating-3 Optical Diffraction slides Central Scientific Company:
$200.00
Wallace Replica Grating-3 Optical Diffraction slides Central Scientific Company. (CENCO) Chicago, Illinois Diffraction grating optics slides. The only place I saw these on line was in the Hood Museum of Art at Dartmouth. Allen King Collection of scientific Instruments. They were produced around 1940. Two are in original boxes that are stained and worn. And one Diffraction slide has no box. One in box is approx.15,000 lines per inch. Another in box is approx. 7500 lines per inch. And the last with no box is plane grating lines to the inch.
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