Calcite bezoar, beige, spherical
Calcite bezoar, beige, spherical
Two large calcite crystals mounted in frame
1851-1950
Two large calcite crystals mounted in a simple wooden frame which allows one of the crystals to be moved longitudinally and the other to be rotated
Brass demonstration polariscope with biaxial crystal
1830-1880
Brass demonstration polariscope with biaxial crystal (calcite?), unsigned, British, 1830-1880. Once the property of Sylvanus P Thompson (1851-1916), professor of physics at the City and Guilds Technical College in Finsbury, England.
De Senarmont Calcite Prism by Edouard Lutz, Paris, 1876
1870-1876
De Senarmont prism (calcite) in felt-lined leatherette-covered wooden case by Edouard Lutz, Paris, c. 1876
Iceland spar
1801-1837
Crystal of Icelandic spar in leather case with test card to show double refraction, early 19th century (B882)
Calcite spine, pear-shaped, fossil
Calcite spine, pear-shaped, fossil
Calcite spine of fossil sea urchin, labelled
Calcite spine of fossil sea urchin, labelled
Polariscope by Harvey & Peak
1884-1889
Polariscope by Harvey & Peak, successors to W. Ladd & Co., Beak St., London, In incomplete wooden case (case front missing), instrument signed.
Calcite bezoars
Calcite bezoars, 4, gold coloured, irregular in shape, from a bull, labelled, found in 1704
Rhobomhedral crystal of 'Iceland Spar' with magnifier
1880-1920
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.