changed the occupational structure of European cities. Printers emerged as a new group of artisans for whom literacy was essential, while the much more labour-intensive occupation of the scribe naturally declined. Proof-correcting arose as a new occupation, while a rise in the numbers of booksellers and librarians naturally followed the explosion in the numbers of books. Educational impact Gutenberg's printing press had profound impacts on universities as well. Universities were influenced in their "language of scholarship, libraries, curriculum, [and] pedagogy" The language of scholarship Before the invention of the printing press, most written material was in Latin. However, after the invention of printing the number of books printed expanded as well as the vernacular. Latin was not replaced completely, but remained an international language until the eighteenth century. University libraries At this time, universities began establishing accompanying libraries. "Cambridge made the chaplain responsible for the library in the fifteenth century but this position was abolished in 1570 and in 1577 Cambridge established the new office of university librarian. Although, the University of Leuven did not see a need for a university library based on the idea that professor were the library. Libraries also began receiving so many books from gifts and purchases that they began to run out of room. However, the issue was solved in 1589 by a man named Merton who decided books should be stored on horizontal shelves rather than lecterns. Curriculum The printed press changed university libraries in many ways. Professors were finally able to compare the opinions of different authors rather than being forced to look at only one or two specific authors. Textbooks themselves were also being printed in different levels of difficulty, rather than just one introductory text being made available. Comparison of printing methods Digital printing By 2005, digital printing accounted for approximately 9% of the 45 trillion pages printed annually around the world. Printing at home, an office, or an engineering environment is subdivided into: small format (up to ledger size paper sheets), as used in business offices and libraries wide format (up to 3' or 914mm wide rolls of paper), as used in drafting and design establishments. Some of the more common printing technologies are: blueprint – and related chemical technologies daisy wheel – where pre-formed characters are applied individually dot-matrix – which produces arbitrary patterns of dots with an array of printing studs line printing – where formed characters