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Description: | plastic Instrument with 2 rectangular layers. One layer is like the base but with 2 cylindrical holes at either end going lengthways. The other layer is on the top. It has a hinge lid which when opened up reveals 16 cogs of numbers with 1-16 on each. There is also numbers 1-16 engraved where the cogs become invisible. The lid has a see-through strip so that one line of the cogs can be seen. The whole apparatus has a metal top to it spanning the length. | 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: | 1940-1950 | Source: | University of Aberdeen | Creator: | AM | Identifier: | http://calms.abdn.ac.uk/Geology/dserve.e... | Go to resource |
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