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Description: | 6 wooden holders containing between a central glass sandwich ( 40 mm diameter ) samples of birefringent selenite showing colours between crossed polaroids. Varnish (or glue) within sandwich badly cracked and brown but this makes little difference to performance. Discs are not numbered. For use in Clarke' black mirror polarizer (ABDNP200075a). | License: | http://www.abdn.ac.uk/historic/Copyright_terms_conditions.shtml | Publisher: | ABDNP University of Aberdeen, Natural Philosophy Collection of Historical Scientific Instruments | Rights holder: | 47718 | Temporal: | 1835-1850 | Source: | University of Aberdeen | Creator: | ' E.M. CLARKE , 428 STRAND , OPTICIAN , LONDON ' stamped on wooden rim. | Identifier: | http://calms.abdn.ac.uk/Geology/dserve.e... | Go to resource |
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