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Johann Heinrich Schulze (12 May 1687 – 10 October 1744) was a German professor and polymath. History [ edit ] Schulze studied medicine , chemistry , philosophy and theology and became a professor in Altdorf and Halle for anatomy and several other subjects.
…the German professor of anatomy Johann Heinrich Schulze proved that the darkening of silver salts, a phenomenon known since the 16th century and possibly earlier, was caused by light and not heat. He demonstrated the fact by using sunlight to record words on the salts, but he made no attempt…
Jul 4, 2010 · In the 1720s German physicist and medical professor Johann Heinrich Schulze baked silver nitrate in an oven to show that light, not heat, caused this discoloration. Schulze also put stencils of texts on glass jars filled with a mixture of chalk and silver nitrate.
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Johann Heinrich Schulze. 1687-1744. German physician and anatomy professor who made a significant discovery in the development of photography when he observed that silver salts darkened when exposed to sunlight. In 1725, while attempting to create a phosphorescent material by combining chalk with nitric acid containing dissolved silver, Schulze ...
Learn how a German anatomist and chemist discovered in 1727 that silver chloride darkens in the light and laid the foundation of photography. See his illustration and the history of alchemical experiments with silver salts.
Drawing on his understanding of the camera obscura, as well as the discovery by German natural philosopher Johann Heinrich Schulze (1687-1744) that silver salts are light sensitive, he began experimenting by coating paper with silver nitrate, then placing it in a camera obscura and exposing it to the Sun's rays. His experiments were ...
Polymath Johann Heinrich Schulze (1687–1744) was one of the major pioneers of photography. In 1719, he discovered that silver nitrate was sensitive to light, and worked out that silver salts...
