Herapathite

Herapathite

Herapathite, or iodoquinine sulfate, is a chemical compound whose crystals are dichroic and thus can be used for polarizing light.

According to Edwin H. Land, it was discovered in 1852 by William Herapath, a doctor in Bristol. One of his pupils found that adding iodine to the urine of a dog that had been fed quinine produced unusual green crystals. Herapath noticed while studying the crystals under a microscope that they appeared to polarize light.

Herapathite's dichroic properties came to the attention of Sir David Brewster, and were later used by Land in 1929 to construct the first type of Polaroid sheet polarizer.

References

*Land, E.H. (1951). "Some aspects on the development of sheet polarizers". "J. Optical Society of America" 41 (12), 957-963.

External links


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Look at other dictionaries:

  • Herapathite — Her a*path*ite, n. [Named after Dr. Herapath, the discoverer.] (Chem.) The sulphate of iodoquinine, a substance crystallizing in thin plates remarkable for their effects in polarizing light. [1913 Webster] …   The Collaborative International Dictionary of English

  • Herapathite — L herapathite ou sulfate d iodoquinine est un composé dont les cristaux sont dichroïques et peuvent être ainsi employés pour polariser la lumière. Selon Edwin H. Land, elle a été découverte en 1852 par William Herapath, un docteur de Bristol. Un… …   Wikipédia en Français

  • herapathite — noun Iodoquinine sulfate, a chemical compound whose crystals are dichroic and thus can be used for polarizing light …   Wiktionary

  • herapathite — her·a·path·ite …   English syllables

  • herapathite — ˈherəˌpaˌthīt, pȧˌ noun ( s) Etymology: William B. Herapath died 1868 English chemist + English ite : a salt of quinine that is obtained by treating the sulfate with iodine in the form of rhomboidal plates capable of polarizing light and that is …   Useful english dictionary

  • Iodoquinine — I o*do*qui nine, n. [Iodo + quinine.] (Chem.) A iodide of quinine obtained as a brown substance,. It is the base of herapathite. See {Herapathite}. [1913 Webster] …   The Collaborative International Dictionary of English

  • Polarizer — For the photographic filter, see Polarizing filter (Photography). A polarizing filter cuts down the reflections (top) and made it possible to see the photographer through the glass at roughly Brewster s angle although reflections off the back… …   Wikipedia

  • Polariseur — …   Wikipédia en Français

  • Polariseurs — Polariseur …   Wikipédia en Français

  • Herapathit — Strukturformel …   Deutsch Wikipedia

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