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Licence
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LicenseOptical square, unsigned, European, 1851-1917
Science Museum Group
© The Board of Trustees of the Science Museum
Optical square, unsigned, European, 1851-1917
Details
- Category:
- Surveying
- Object Number:
- 1917-22
- Materials:
- metal (unknown), brass (copper, zinc alloy) and glass
- Measurements:
-
overall: 25 mm 55 mm, .125kg
- type:
- optical square
- credit:
- Court, Thomas Henry
