@misc{Lengenfeld, author = {Lengenfeld, Jonas}, title = {Simply complex: Case studies on complex stone constructions of High Medieval courtly chimneys}, series = {History of construction cultures : proceedings of the 7th International Congress on Construction History (7ICCH 2021), July 12-16, 2021, Lisbon, Portugal. Volume 2}, journal = {History of construction cultures : proceedings of the 7th International Congress on Construction History (7ICCH 2021), July 12-16, 2021, Lisbon, Portugal. Volume 2}, editor = {Mascarenhas-Mateus, Jo{\~a}o and Paula Pires, Ana}, publisher = {CRC Press}, address = {Boca Raton}, isbn = {978-1-00-317343-4}, doi = {10.1201/9781003173434-119}, pages = {55 -- 62}, language = {en} } @misc{Lengenfeld, author = {Lengenfeld, Jonas}, title = {The complex masonry of the Sch{\"o}nburg castle keep chimney system (1201 CE) in the context of contemporary examples}, series = {Timber and Construction: Proceedings of the Ninth Conference of the Construction History Society}, journal = {Timber and Construction: Proceedings of the Ninth Conference of the Construction History Society}, editor = {Campbell, James and Baker, Nina and Driver, Michael and Heaton, Michael and Ruamsanitwong, Natcha and Wall, Christine and Yeomans, David}, publisher = {The Construction History Society}, address = {Cambridge}, isbn = {978-0-9928751-8-3}, pages = {23 -- 37}, language = {en} } @misc{Lengenfeld, author = {Lengenfeld, Jonas}, title = {Some points on the construction of high medieval slewing cranes in towers in Germany based on Building archaeology and a new find from the early 13th century}, series = {Studies in Construction History : the Proceedings of the Tenth Annual Conference of the Construction History Society : Queen's College, University of Cambridge, 12-13 April 2023}, journal = {Studies in Construction History : the Proceedings of the Tenth Annual Conference of the Construction History Society : Queen's College, University of Cambridge, 12-13 April 2023}, editor = {Campbell, James}, publisher = {Construction History Society}, address = {Cambridge}, isbn = {978-0-9928751-9-0}, pages = {57 -- 74}, abstract = {The cathedrals and lavish secular buildings of the high medieval era bear witness to the level of skill with which heavy ashlars were hoisted and laid by the contemporary craftsmen. However, due to the lack of sources like treatises and naturalistic depictions we know comparably little about the cranes they used. To refine our knowledge of high medieval cranes this paper discusses their construction and technical capabilities based around preserved machines and finds examined with the methods of building archaeology.}, language = {en} } @misc{Lengenfeld, author = {Lengenfeld, Jonas}, title = {Building service solutions in the first half of the 13th century CE. - variations of the same tasks in the two towers of the Margraves of Baden in Besigheim}, series = {Construction Matters. Proceedings of the 8th International Congress on Construction History}, journal = {Construction Matters. Proceedings of the 8th International Congress on Construction History}, editor = {Holzer, Stefan and Langenberg, Silke and Knobling, Clemens and Kasap, Orkun}, publisher = {vdf Hochschulverlag AG}, isbn = {978-3-7281-4166-8}, doi = {10.3218/4166-8}, pages = {833 -- 840}, abstract = {The relative chronology and ideas behind development in medieval building services are often difficult to prove. Especially concerning the High Middle Ages, the acquisition of knowledge is hindered not only by the large amount of unpublished unknown or destroyed objects, but also by the lack of written sources. With the two towers of Besigheim in southern Germany, well-preserved examples of stately architecture extant to this day. A detailed Building Archeological survey of them can offer us a regionally and temporally fixed insights into building services, their variations and the ideas which underpinned them.}, language = {en} }