Iceland spar
1801-1837
Brass demonstration polariscope with biaxial crystal
1830-1880
Calcite spine, pear-shaped, fossil
Calcite spine of fossil sea urchin, labelled
De Senarmont Calcite Prism by Edouard Lutz, Paris, 1876
1870-1876
Calcite prism used by Col. J. W. Gifford
Nicol prism polariser
1900-1936
Nicol prism polariser
1900-1936
Nicol prism polariser
1900-1936
Polar clock (Wheatstone type) by J. Soleil
1845-1855
Polariscope to show rings in axis-cut crystals
1825-1835
Nicol prism polariser
1900-1936
Nicol prism polariser
1900-1936
Nicol prism polariser
1900-1936
Two large calcite crystals mounted in frame
1851-1950
Rhobomhedral crystal of 'Iceland Spar' with magnifier
1880-1920
Wheatstone's Polariscope
1833-1867
Calcite crystal, by C.D. Ahrens
Calcite crystal with rhomb faces
Calcite bezoars
Polariscope by Harvey & Peak
1884-1889