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Prism

Prism. Glass

Prism of quartz: square section

Hartridge prism

1984

Small prism in cylindrical brass fitting

Prism of quartz: triangular action

Glass prism showing the illusion of a goblet

1845-1855

Rangefinder centre prism, strip field type

Centre separating prism for Barr and Stroud rangefinder

1920

Reversing Prism for 16mm Back Projection

One of a pair of prisms in frames

Prism type LF 2349 as generated on Blanchard surface grinder by Barr and Stroud Ltd.

1986

Carbon disulphide prism, one of four by William Ladd

1870-1884

Carbon disulphide prism, one of four by William Ladd

1870-1884

Fluorite Prism by Adam Hilger Ltd.

1900-1905

Carbon disulphide prism, one of four, c.1900.

Carbon disulphide prism, one of four, c.1900.

1875-1885

Prism of uranium glass chipped (le. 7 1/16", side 1 11/16"), c.1850. May have belonged to John Lee of Hartwell House, Ayesbury, Bucks. England.

Prism of uranium glass

1845-1855

Two compound prisms for direct vision spectroscope by E. Lutz, Paris, 1876. Total length 11.3 cm and 10.8 cm. Length of each prism 2.6 cm

Two compound prisms for direct vision spectroscope by E. Lutz

1876

Prism of crown glass angle 90 degree, length 68mm

Prism of crown glass angle 90 degree, length 68mm

Sodium Chloride (rock salt or NaCL) prism, for Infrared spectrophotometry [model 137] in sealed glass cover. Manufactured by Perkin Elmer Ltd.

prism

Three prism solar spectroscope with equatorial mounting engraved 'Royal Society - 1867', made by Troughton and Simms, London, in two cases

Three prism solar spectroscope with equatorial mounting and cases

1867

Three-prism solar spectroscope with automatic prism adjustment for minimum deviation and a fixed equatorial mounting with drive by Howard Grubb, Dublin, dated 1871. Supplied by the Royal Society of London to J.B.N.Hennessey who used the instrument at Vincent Hill, Dehra Dun in the Indian foothills [7,000 ft.] of the Himalayas to map the solar spectrum between 1871-5.

Solar spectroscope by Howard Grubb, Dublin, 1871

1871

Echelon spectroscope, with wave length drum (Prism and Echelon grating chipped) by Adam Hilger Ltd., London, England, 1905, comprised of two units: constant deviation spectrometer and echelon grating.

Echelon spectroscope

1905

One of a pair of prisms in frames

One of a pair of prisms in frames

Prism assembly from the Hadland hyspeed camera, 1980s. With two small plastic covers. In carton.

Prism Assembly from the Hadland Hyspeed camera

1980s

Carbon disulphide prism, one of four, c.1900.

Carbon disulphide prism, one of four, c.1900.

1875-1885

Solar spectroscope with stand and two mahogany boxes by T. Cooke and Sons, York, England, 1881. Used at the Solar Physics Observatory, South Kensington between 1881 and 1912. The set of prisms give a high dispersion equal to 20 prisms, by passing the light through the prisms train four times.

Solar spectroscope by T. Cooke & Sons, 1881

1881

Heptagonal prism a semi-regular solid, one of four prism models, made of coloured card by Mr R. Buckley, c.1973.

Heptagonal prism a semi-regular solid

1973

Heptagonal star prism a semi-regular solid, one of four prism models, made of coloured card by Mr R. Buckley, c.1973.

Heptagonal star prism a semi-regular solid

1973

Glass prism with brass handles, made 1850-1924

Glass prism with brass handles

1850-1924