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Dagron, René Prudent Patrice   
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Dagron, René Prudent Patrice
1819 (Beaumoint) - 1900 (Párizs)

French photographer, optician, and inventor. He studied physics and chemistry. He was one of the firsts to do microscopic photography. From 1860 he run a shop in Paris selling photographic supplies, he advertised his microscopic photographs on jewels. In 1861 he obtained a patent for "Microscope Bijou" and presented it on different exhibitions. In 1864 he constructed his micrographic camera that he could use to photograph the 450 French members of parliament in one square millimetre. He developed and sold the Stanhope lens adapted for watching microphotographs.

From 1865 he was a court photographer, he also produced photo-ceramics.

At the beginning his invention was used only for decorating jewels, but in 1871, at the siege of Paris it was used for more practical purposes, when information, news recorded in microscopic photographs put under the wings of carrier pigeons could be successfully got out from the sieged city and later was enlarged so that could be read. With the help of this process a single pigeon could take 18.000 dispatches beyond the Prussian lines.