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Description: | 2 prisms with gap between them in metal tube, showing from circular window. Metal tube stand on two cylindrical legs both with circular aperture near feet showing a prism. Brass handle on top tube which turns between 2 choices "Wedge" or "Negative". On leg is manufacturers name | 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: | 1837-1872 | Source: | University of Aberdeen | Creator: | W. Watson & Sons, Ltd | Identifier: | http://calms.abdn.ac.uk/Geology/dserve.e... | Go to resource |
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