Accession No
2589
Brief Description
optic square, which shows you an exact right angle, 1900 (c)
Origin
Maker
Class
surveying
Earliest Date
1900
Latest Date
1900
Inscription Date
Material
metal (alloy)
Dimensions
diameter 53mm; thickness 20mm
Special Collection
Provenance
Inscription
Description Notes
Metal alloy. Pinhole sights. 2 windows at 90 degree half silvered mirror and prism.
References
Events
FM:44531
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