“Chemistry is the study of matter, but I prefer to see it as the study of change. Now, just think about this. Electrons, they change their energy levels. Molecules change their bonds. Elements, they combine and change into compounds. Well that's... That's all of life, right? It's the constant, it's the cycle... It's solution, dissolution, just over and over and over. It's growth, then decay, then transformation. It is fascinating, really.” (Pilot 1:1 Breaking Bad). This quote really describes the basis for this chapter in that the use and application of chemistry heavily changed and influenced numerous technologies. Advances through chemistry allowed photography to come about and also allowed the production of cheap steel. These are just some of the numerous technologies that of which were able to come about and advance through the use of chemistry.
The first technology discussed was imaging technology starting with photography. At first the general idea of photography was relatively simple such that certain materials transformed from exposure to light. In 1728 a German Chemist noticed that the materials used darkened upon exposure to light and in fact darkened too much to the point rendering the photograph useless. Chemists then began to experiment on ways to stop this darkening yet progress in their experiments was slow to emerge. Toward the end of the 18th century a new imaging technology began to emerge called lithography. Alois Senefelder disgusted by the unreliable printing of his plays discovered how to apply printable images to the surface of stone. The surface used was a flat stone coated with ink adhering and repelling substances. One of the common materials used in lithography is a substance called Bitumen1 which was later discovered to be photosensitive. An inventor named Joseph Niepce used this substance to create an image from a camera thus making a breakthrough in the world of photography. Two popular techniques of photography emerged one known as the “Daguerreotype2” created by Louis Daguerre and negative imaging created by William Talbot. These techniques were widely known to be the most effective ways of photography up until 1851 when Frederick Archer began to use glass plated coated with a photosensitive solution called Collodion3. This was a huge breakthrough being that this method was cheap and much more versatile than the previous techniques due to its need for less light exposure and ability to make unlimited prints.
(Brady, Mathew) Battery No. 4, Yorktown, VA in May, 1862
.Collodion Print. Collodion emulsions were used in “wet plate” photography.

(http://www.alincolnbookshop.com/html/lincolnpix_civil_war.htm)

Photography has served numerous purposes over the years. It has been widely used in practical ways such as documenting our history dating back to its early stages widely used to document the civil war. Other than practical uses photography has been widely used as a form of art and hobbies. Photography is widely used as a form of art and expression allowing people to express themselves through their pictures. Photography is a special kind of technology in that it influenced our world in many aspects from practical uses such as documentation to recreational uses such as art. The use of photography has been ongoing for centuries and will be for many more to come. The next technology discussed was metal and its uses and advancement throughout centuries. No single material became as closely identified with the material progress if the nineteen century than iron. The most important event in the transformation of the material world of the 19th century was the introduction of cheap steel. This all began with Henry Bessemer, an English artisan, in the year 1854. Before Bessemer the furnace used to create steel was extremely