Rhobomhedral crystal of 'Iceland Spar' with magnifier

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