The Internet has revolutionized communication. People can send and receive text and images on a daily, if not hourly basis. So why not have instant access to the images we can capture without waiting for a film to develop? Let’s take a look at the beginnings of camera technology.
It all began with the camera obscura
The camera obscura was simply a tiny hole in a sheet of material over a window in an otherwise darkened room. Rays of daylight would then project a reversed Image of the scene outside the room on the opposite wall.
While the camera obscura was capable of creating a faithful image, there was no way of recording it other than manually with a pen or paintbrush. Unfortunately, photosensitive chemicals, the active components in camera film were not around until the 18th century. The seeds were sown, however, when a light-sensitive chemical was created accidentally the 1720s from mixing chalk, nitric acid and silver in a flask.
It was not until the early 1800s that such chemicals were used for recording images. One of the early pioneers was Thomas Wedgwood, who made pictures by placing objects onto sheets of leather that had been soaked in silver nitrate, and then left out in the sun to dry. Then in 1816 a camera obscura was constructed which used photosensitive paper.
Read more of the article here