Rhombohedral calcite crystal, 'Iceland Spar' prism with brass eye piece magnifier (removed from instrument), unsigned, European, 1880-1920. Used to demonstrate the double images produced by the mineral calcite.
Details
- Category:
- Optics
- Object Number:
- 1980-924
- Materials:
- calcite, brass (copper, zinc alloy) and glass
- Measurements:
-
crystal: 28 mm x 80 mm x 80 mm,
eyepiece: 35 mm 30 mm, Overall Wt. 0.223
- type:
- double image prism, eyepiece and magnifying glass
