1. History of Photography 1800-1850
By Keith Salyer

2. Thomas young 1801
Thomas Young Suggested that the retina at the back of the eye contains three types of color sensitive receptor, one sensitive to blue light, one to green and one to red. The brain interprets various combinations of these color's to form any other color in the visible spectrum.

3. Thomas Wedgewood 1802
Thomas Wedgewood is the first person to attempt to record the camera image by means of the action of light (he is successful in recording the image in organic substances such as the darkening silver nitrate on white leather or paper when exposed however he is unable to find a way to make these images permanent or ÒstopÓ the darkening permanently)

4. Joseph N. Niepce 1816
Joseph N. Niepce made a crude photographic camera from a jewel box and a simple lens. With it he made a negative image.

5. The Daguerre Process 1839
Lois J.M. Daguerre invented daguerreotype process. The image was recorded on a silver plate made light sensitive with iodine. The plate was then developed in mercury creating a photo

6. Sir John Herschel 1839
Sir John Herschel used sodium thiosulfate, or hypo, to make pictures permanent.

7. Mungo Ponton 1840
Mungo Ponton (Scottish) demonstrated how he used potassium bichromate to sensitize his papers (instead of silver salt which was more expensive) and the ability to control the sensitivity of the paper according to how much of the chemical was mixed with water before being spread on the paper.

8. Alexander Wolcott 1840
First American patent issued in photography to Alexander Wolcott for his camera.

9. William Henry Fox Talbot 1841
Talbot announced an improvement in his photogenic drawing process: the Calotype (beautiful picture), which developed a latent image (instead of waiting for the image to appear on the sensitized surface during exposure). It created negatives which were then used to make positives. He patented this on Feb 8, 1841

10. 1843
First advertisement with a photograph made in Philadelphia

11. Levi L. Hill 1850
Levi L. Hill publicly announced his success in fixing the colors of nature on daguerrotype plates, however he would not release his secret to the public, not even for $100,000. Later, it was discovered he had not properly figured out how to achieve color, and from time to time, other daguerrotypists would find they had accidentally somehow recorded color images as well, but most faded.

12. References p2.la-img.com

13. The End!!!
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