http___en.wikipedia.org_wiki_Johann_Heinrich_Schultz_2.xml
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Йохан Хайнрих Шулц Йохан Хайнрих Шулц (на немски: Johann Heinrich Schulze) e немски професор, най-известен с откритието, че някои соли на среброто, най-вече сребърен хлорид и сребърен нитрат, потъмняват в присъствието на светлина, както и за използването на тези ефекти да улови временни фотографски изображения. В експеримент, проведен през 1724 г. той установява, че смес от сребро и тебешир отразява по-малко светлина, отколкото чисто сребро. Въпреки че откритието му не осигурява условия за запазване на изображението, то дава основата за по-нататъшна работа, която довежда до създаването на фотографията.
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Johann Heinrich Schulze Johann Heinrich Schulze or Schultz (12 May 1687 – 10 October 1744) was a German professor and polymath from Colbitz in the Duchy of Magdeburg. [edit] History Schulze studied medicine, chemistry, philosophy and theology and became a professor in Altdorf and Halle for anatomy and several other subjects. [edit] Notable discoveries Schulze is best known for the discovery that certain silver salts, most notably silver chloride and silver nitrate, darken in the presence of light, and for using those effects to capture temporary photographic images.[1] In an experiment conducted in 1724 he determined that a mixture of silver and chalk reflects less light than untarnished silver. Though his discovery did not provide the means of preserving an image - the silver salts continued to darken unless protected from light - it did provide the foundation for further work in fixing images. Joseph Nicéphore Niépce made partially fixed images using silver salts in 1816; the first permanent photograph based on this principle was made shortly after by William Henry Fox Talbot. Other researchers in this field included Thomas Wedgwood and Sir Humphry Davy.[1] [edit] See also [edit] References - ^ a b Leslie Stroebel and Richard D. Zakia (1993). The Focal encyclopedia of photography (3rd ed.). Focal Press. http://books.google.com/books?id=CU7-2ZLGFpYC&pg=PA6.