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Petrographical microscope

Polarising microscope condenser lens assembly and polarising eyepiece with circular scale

Mrs Spottiswoode's pocket polariscope

Nicol polarizing prism

1871-1900

Nicol prism, in cylindrical brass mount

1870

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

1875-1924

Compound monocular microscope in case (lacks handle)

1851-1900

Large projection polariscope in three mahogany cabinets

1875-1880

Polarising Prism

1895-1905

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

Monocular "jug-handle" microscope with, mechanical stage and fine focusing, with various accessories, including 4 objectives, 3 objective changers, 4 eyepieces, micrometer and goniometer eyepieces, analyser and polariser, 2 nicol prisms, constant temperature bath, once owned by W.M. Bayliss, by Zeiss, German, 1900-1910

Monocular "jug-handle" microscope with

1900-1910

1 P & L goniometer eyepiece, 1 P & L Filar micrometer eyepiece, 1 P & L coverglass micrometer, 1 P & L substage condenser, 1 P & L Nicol prism, 1 Zeiss Browning eyepiece spectroscope, 1 set Leitz objective changers

Microscope accessories by Zeiss, Powell & Lealand, and Leitz