In the 1870s, newspapers and printers faced a very specific and very costly problem. Photography was a new and exciting medium at the time. Readers wanted to see more pictures, but nobody could figure out how to print images quickly and cheaply. For example, if a newspaper wanted to print an image in the 1870s, they had to commission an engraver to etch a copy of the photograph onto a steel plate by hand. These plates were used to press the image onto the page, but they often broke after just...