Extensions Over the ensuing centuries, the museum was gradually extended. The arrangement of each new part was consistent with the insights of the day; thereafter it remained almost wholly unchanged. In the 19th century, the museum was expanded with two painting galleries: Teylers First Painting Gallery in 1838 and Paintings Gallery II in 1892. In 1878, to mark the first centenary, a new entrance on the Spaarne (the current main entrance) was designed by the Viennese architect Christian Ulrich. It opened in 1885. The rooms behind it – the Instrument Room, and Fossil Room I and, behind it, Fossil Room II – were designed by the Haarlem architect A. van der Steur. At the same time, the library was extended and a 150-seat auditorium was added. Over a century later, in 1996, a large new wing was added; this was the design of Hubert-Jan Henket. In 2002, an adjoining property was added to the museum to serve as the museum shop and multimedia room. Collection Teylers Museum holdings include fossils (some are the first ever discovered of Archaeopteryx), minerals, scientific instruments, medals, coins, and paintings. The museum’s first director, Martinus van Marum contributed to and used the facilities at Teylers Museum to research static electricity. To study fossils, he purchased fossil material such as the Mosasaurus. To demonstrate the principles of hydraulics, he commissioned models of mills and cranes. To disseminate natural and cultural knowledge, public experiments were conducted, such as those with van Marum’s large electrostatic generator built in 1784 by John Cuthbertson in Amsterdam (the largest in the world). Lectures were given and scientific literature published. The collection of Teylers Museum holdings include works by Michelangelo, Raphael, Guercino, and Claude Lorrain. The museum contains graphic work of Rembrandt and Adriaen van Ostade. The Painting Galleries show a collection of works from the Dutch Romantic School and the later Hague and Amsterdam Schools, including major works by Barend Cornelis Koekkoek, Andreas Schelfhout, Cornelis Springer, Hendrik Willem Mesdag, Jan Willem Pieneman, Anton Mauve, Jacob Maris, Jan Hendrik Weissenbruch, George Hendrik Breitner, Jozef Israëls, and Isaac Israëls. In 2007, the works of John James Audubon were displayed. The original mission of the second society included research, as well as education. After the death of van Marum, Teylers continued to attract scientists of high standing as caretakers. The theoretical physicist and Nobel Prize winner Hendrik Lorentz was appointed Curator of Teylers Physics