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The Invention of Photography

In Our Time

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The Crucial Puzzle of Wedgwood's Technique

Thomas Wedgwood was the son of the great potter, Josiah Wedgwood. He worked extremely hard to see if it was possible to use the strange optically sensitive behavior of silver salts by soaking leather with those salts and then exposing them to light. The clever trick was to put on the leather or some other surface, an object, so this would be what we would call a contact image.

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