while his work as a critic was less notable than that of lange, his contributions to the history of architecture were more successful. these included "hvem har bygget frederiks hospital?" (who built frederik's hospital?) in 1899 and "en bygning af harsdorff i trondhjem" (a building by harsdorff in trondheim) in 1901. however, he is remembered above all for his work on the first and second series of denmark's biographical dictionary of artists and architects known as "weilbachs kunstnerleksikon", first published in 1877–1878 and again in 1896–1897. these solid works are based on rich background material as well as on archival sources and include personal contributions from artists who were still living at the time. in 1892 weilbach became a knight of the order of the dannebrog.