1. A daguerreotype, which was invented in 1839, is a photograph that is taken by an early process using an iodine-sensitized silver plated surface and mercury vapor. This kind of photograph resembles a mirror because the image is, at an angle, is reflected off of the silver surface to create a dark image. They were popular and prominent during the time period of 1840-1855, and it replaced the process of the camera obscura.
3. A stereograph is a specific technique that is used to show the depth in a picture by placing the to 2D images together in order to form a 3D image while using a stereoscope. The technique, which was invented in 1860, was very popular then and for the next few decades.
4. A carte de visite was a tiny albumen print that was commonly used as photo cards throughout the 1800's.
5. Matthew Brady as a well known American photographer during the 1800's who was made famous by his photos of celebrities and records of the American Civil War. Alexander Gardner, a Scottish photographer,was famous in the United Sates, from his images of the Civil War and of Lincoln. Both of them are notable for daguerrotype photography and they were active during the Civil War time period.