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Iceland spar

Iceland spar

1876
Nicol polarizing prism

Nicol polarizing prism

1871-1900
Nicol prism, in cylindrical brass mount

Nicol prism, in cylindrical brass mount

1870
Foucault prism (one half of complete polarizing prism)

Foucault prism (one half of complete polarizing prism)

1876
Petrographical microscope

Petrographical microscope

Bertrand prism of Iceland Spar

Bertrand prism of Iceland Spar

Polarising microscope condenser lens assembly and polarising eyepiece with circular scale

Polarising microscope condenser lens assembly and polarising eyepiece with circular scale

Mrs Spottiswoode's pocket polariscope

Mrs Spottiswoode's pocket polariscope

De Senarmont Calcite Prism by Edouard Lutz, Paris, 1876

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

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

1875-1924
Eleven Nicol prisms from set of 12, in case

Eleven Nicol prisms from set of 12, in case

1876
Nicol prism polariser

Nicol prism polariser

1900-1936
Nicol prism polariser

Nicol prism polariser

1900-1936
Nicol prism polariser

Nicol prism polariser

1900-1936
Rachon prism (cement joint broken)

Rachon prism (cement joint broken)

Nicol Prism by Edouard Lutz, Paris, 1876

Nicol Prism by Edouard Lutz, Paris, 1876

1870-1876
Differential ratio polariscope by Negretti and Zambra

Differential ratio polariscope by Negretti and Zambra

Nicol prism polariser

Nicol prism polariser

1900-1936
Nicol prism polariser

Nicol prism polariser

1900-1936
Nicol prism polariser

Nicol prism polariser

1900-1936
Prasmowski prism - length 4.9cm

Prasmowski prism - length 4.9cm

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

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
Nicol prism in brass tube with extension, by C.D. Ahrens

Nicol prism in brass tube with extension

Large Diameter (380mm) Polariser roller-mounted on cast iron stand for rotation about a horizontal axis

Large Diameter Polariser

components of patent projective microscope by Newton & Co., London, c.1887. Comprises, fitted 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. Components of Patent projective microscope by Newton & Co., London, c. 1887.

components of patent projective microscope by Newton & Co

1885-1890
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