was appointed in 1936. In the early years the library served only professors. It was opened for students in 1869, and for the general public in 1884. In 1884 the first classification system of the library was elaborated and the first printed catalogue of the library was published by Vince Wartha, who was by the way professor of urban chemical technologies, dealing with construction materials, with gas production and water supply, and rector of university two times. In the following years extended editions of the printed catalogue were published and distributed to the departments and to other major libraries in the country. In 1936 the library introduced the index card system of catalogue. Transition to electronic cataloguing began in the 1980s, and the integrated library system was introduced in the 1990s. With the spreading of internet and widening the bandwidth the catalogue has become available from anywhere. The library collection was extended by acquisitions, and with donations of professors. There were two major additions by receiving the heritage of baron József Eötvös in 1872, and of Károly Hieronymi engineer and politician in 1912. During the Second World War both the building and the collection were damaged. Nevertheless, it continued its work in 1945, and the main reading room was reopened during the academic year of 1949–1950. Since 1952, increasing amount of the collection has been placed on open shelves for direct access of the readers. In the beginning only fiction, later on handbooks, and nowadays textbooks and current literature can be found on the shelves in the reading rooms. In 1953 the library started publishing serials (Methodical papers of the Central Library of Budapest Technical University, publications on history of science and engineering, Scientific Technical Bibliographies) and some other serials in the 1960s. Since the mid sixties the library takes part in the instruction of first year students with training on using the library and in teaching literature search skills. In 1991 the library opened the Study of Natural Sciences with mostly chemistry-regarded literature open shelves. The library is the centre of the library network of the university, and the thematic library in mathematics and physics. The National Technical Information Centre and Library (OMIKK) In 1883 Ágoston Trefort, minister of education opened the Technological Museum including a library consisting the “basic Hungarian and international literature dealing with industry”. In 1889 the library was moved and merged with the library of