This technique was used to reproduce images. It used drawings on a flat surface, like a flat stone. Perfected by Alois Senfelder. The advantages of this technique was that it could yield a large number of prints and it could render tones and shadows. Later on, Joseph Nicephore Niepce was unable to use the lithographic stone and began to find another way to produce an image with photosensitive materials.
Thomas used paper and white leather coated with silver nitrate to make first images and noticed that leather is more light-sensitive. His main idea was to use camera obscura in his process but chemicals that he used were not sensitive enough and needed too much time to show any effect.
United States agrees to pay France $15 million for the Louisiana Territory, which extends west from the Mississippi River to the Rocky Mountains and comprises about 830,000 sq mi.
World's first permanent photograph
Niepce used pewter plates inside a camera obscura and produced what is known as the world's first photograph - 'View from the window'. Exposure time took about 8 hours.
Collaboration of Niepce & Daguerre
At this point, Niepce and Daguerre joined forces and worked together on perfecting photography.
Indian Removal Act
President Jackson signs the Indian Removal Act, which authorizes the forced removal of Native Americans living in the eastern part of the country to lands west of the Mississippi River.
Introducing the Daguerretype
Following experiments on his own (Niepce died in 1933) Daguerre evolves a workable process which he calls the Daguerreotype. Silver iodide coated copper plate is exposed and developed by mercury to give a single direct positive. Removing the remaining silver iodide with a warm solution of cooking salt. Exposure time was about 5 minutes. *Photo attached - 'Still life', made by Daguerre in 1837, is the earliest reliably dated daguerreotype
"I want the world to know"
Aug 19, 1839
Photography was publicly presented to the world at a joint meeting of the Academy of Science & The Academy of Fine Arts in Paris, France. Although, Daguerre was the inventor, it was announced by Francois Arago.
The is invented
Invented by John Herschel. A sheet of paper is brushed with iron salt solutions and dried in the dark. An object is then placed on the sheet in direct sunlight. After about 15 minutes a white impression of the subject formed on a blue background. The paper is then washed in water and oxidation produces the brilliant blue – or cyan – that gave the process its name.
*Photo attached by Anna Atkins who used cyanotype to document plant life and seaweed.
1846 - 1848
U.S. declares war on Mexico in effort to gain California and other territory in Southwest.