19 Polytechnical School in 1875. The Forestry Collections in Tharandt, on the other hand, house a wealth of instructive visual aids and reference materials, such as beetles, snails, butterflies, mosses, lichens, woods, forestry equipment and measuring instruments. However, the Academy of Forestry in Tharandt with its extensive collections was not affiliated to the Technical College until 1929. Thanks to the prospering “young industries” and their proximity to science, the spectrum of collections grew noticeably at the end of the 19th century. The increasing scientific collaboration with renowned companies also contributed significantly to the expansion of the experimental basis and the collection-related visual aids. One of the collections created during this period was the Chemistry Department’s Dye Collection. The comprehensive collection of dye samples documents impressively the worldwide development of dye chemistry and the dye industry. It is still used today to identify and compare dye samples. The electrotechnical collections also have their origins in these years. A particularly high-caliber collection is the “Historical Didactic Museum of Photography” (part of today’s Hermann Krone Collection), established by Hermann Krone and donated to the Technical College on the occasion of his retirement in 1907. The cultural and historical significance of numerous photographs, daguerreotypes and instruction charts handed over by this pioneer of scientific photography from Saxony extends far beyond the University. One particular feature of the institutionalization of Dresden’s collections of didactic and museum objects deserves to be emphasized: From the beginning, due to their evident specialist skills, professors at the Polytechnical College and its successor, the Technical College were also entrusted more and more with the supervision of the important scientific and technical collections as well as with the museums in the city of Dresden. It is in this personal union that the exemplary sample collection of architecture set up by Hermann Hettner and Cornelius Gurlitt also had its origins. This collection was used both as a source and as comparative material for studies in art history, architecture and construction technology. Mechanical-Technological Collection In 1905, the Mechanical-Technological Collection was reestablished in the attic of the newly constructed College Building (now the Zeuner Building) of the Mechanical Department.
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