Salomon Kleiner: *Dilucida Repraesentatio Magnificae et Sumptuosae Bibliothecae Caesareae*, copperplate engraving, 1737

Salomon Kleiner: *Dilucida Repraesentatio Magnificae et Sumptuosae Bibliothecae Caesareae*, copperplate engraving, 1737

Cross-section of the central oval cupola of the Great Hall of the former Court Library (today the Austrian National Library)