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Iceland spar

1876

Rachon prism (cement joint broken)

Nicol polarizing prism

1871-1900

Petrographical microscope

Polarising microscope condenser lens assembly and polarising eyepiece with circular scale

Foucault prism (one half of complete polarizing prism)

1876

Mrs Spottiswoode's pocket polariscope

Nicol prism, in cylindrical brass mount

1870

Prasmowski prism - length 4.9cm

Bertrand prism of Iceland Spar

De Senarmont Calcite Prism by Edouard Lutz, Paris, 1876

1870-1876

Pair of nicol prisms fitted on single bone-handled mount one of the prisms being rotatable

1875-1924
Set of 12 Nicol prisms in case by E. Lutz, Paris, c. 1876.

Set of 12 Nicol prisms in case by E. Lutz

1870-1876
Selection of six Nicol prisms (cemented composite crystal of Iceland spar - calcite), unsigned, supplied by James Swift and Son Limited, London, England, 1900-1936.

Six Nicol prism polarisers

1900-1936
differential ratio polariscope by Negretti and Zambra, London, type devised by J. J. Field in 1869. fitted with a large Nicol prism 1 1/4"x2 1/2", with analysing prism and descriptive pamphlet

Differential ratio polariscope by Negretti and Zambra, with rotating prism

Polarising prism in rotating brass mount B908

Polarising prism in rotating brass mount B908

Patent projective microscope by Newton & Co., London, c.1887. Fitted with 5-inch condenser, front lens with rack work, polarising prism and arm, convergent systems, iron lined body made for electric or limelight rotating-divided stage and analyser, also substage condensers nos. 2 & 5, in wooden case. The accessories comprises 4 objectives 1/4 undulation and Klein's quartz plates, adjustable slit, 4 diaphragms, additional condensers, adapting tubes etc.

Patent projective microscope by Newton & Co.

1885-1890