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HERAPATHITE

Herapathite

Chemical compound

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

Herapathite

Polarizer

Optical filter device

effect is strongly wavelength dependent and the crystal appears coloured. Herapathite is also dichroic, and is not strongly coloured, but is difficult to grow

Polarizer

William Bird Herapath

English surgeon and chemist

1868) was an English surgeon and chemist known for his discovery of Herapathite. Herapath was born in Bristol, the eldest son of William Herapath, Professor

William Bird Herapath

William_Bird_Herapath

John Herapath

British astronomer (1790–1868)

the chemist and William Bird Herapath, the physician who discovered herapathite. In 1847 he published an early textbook on mathematical physics. Herapath's

John Herapath

John_Herapath

Polaroid (polarizer)

Optically active material

Land, consists of many microscopic crystals of iodoquinine sulphate (herapathite) embedded in a transparent nitrocellulose polymer film. The needle-like

Polaroid (polarizer)

Polaroid_(polarizer)

Dichroism

Reflecting only some colours of light

differing polarizations.[dubious – discuss] In some materials, such as herapathite (iodoquinine sulfate) or Polaroid sheets, the effect is not strongly

Dichroism

David Brewster

British astronomer and mathematician (1781–1868)

Polaroid film was inspired by the account of the optical properties of herapathite that he encountered in Brewster's book The Kaleidoscope, Its History

David Brewster

David_Brewster

Herapath

Surname list

William Bird Herapath (1820–1868), British surgeon/chemist who patented Herapathite Herapath's Journal, a 19th-century British railway journal edited by

Herapath

Greg Weight

Australian photographer and writer

Weight's great-grandfather was William Bird Herapath was the inventor of Herapathite, the crystals that became the basis of polaroid lenses used in spectacles

Greg Weight