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includes an undertaking by Niépce to release details of the process he had invented - the asphalt process or heliography.Daguerre was sworn to secrecy under penalty of damages, and undertook to design a camera and improve the process.Johnson assisted Beard in setting up a portrait studio on the roof of the Regent Street Polytechnic and managed Beard's daguerreotype studio in Derby and then Manchester for some time before returning to the US.

Niépce's early experiments had derived from his interest in lithography and centered around capturing the image in a camera (then called a camera obscura) to result in an engraving that could be printed somehow by lithography.

) process, or daguerreotypy, was the first publicly available photographic process, and for nearly twenty years it was the one most commonly used.

Invented by Louis-Jacques-Mandé Daguerre and introduced worldwide in 1839, daguerreotype was almost completely superseded by 1860 with new, less expensive processes yielding more readily viewable images.

Their correspondence reveals that Niépce was at first reluctant to divulge any details of his work with photographic images.

To guard against letting any secrets out before the invention had been improved, they used a numerical code for security.




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