A project, established at the Graphic Faculty of the University of Zagreb, will reconstruct and implement the whole printing system which was used in printing the incunabulum ‘The Missal of Senj’, the first printed book on the Croatian soil. I have decided to perform this work as an overture into this great project. The first part of my work shows a section of history and development of writing system. Eternal human hard work and desire to record his thoughts and to keep them recorded for new generations has developed and finally yielded fruit without which it is quite impossible to imagine the life nowadays. Deservedly I have dedicated one part of my work to Gutenberg, called father of typography. The second part talks about beauty and value of Slavonic and Croatian incunabula, as well as about the founding and work of printing house in Senj, for what is the most meritorious Blaž Baromić, one of the most important persons in Croatian cultural history. The main chapter is just dealing with the reconstruction of the printing press of Senj. I have tried to show, by many technical drawings and drafts, how the procedure of making replica will go on and I have explained in what way all connections are resolved. I have also thrown light on the principle of work in particular subsystems of printing press. The purpose of my work is to prepare, as well as possible, the concept of technical documentation for the project of making replica of the first Glagolic press of Senj.