I happened to came across the catholic priest and Hungarian Academy member Tivadar Ortvay's (Theodor Orthmayer) decription on the islands of the Danube. This article was published in the 15 th volume of the "Mathematikai és Természettudományi Közlemények" (Bulletin for Mathematics and Natural Sciences) in 1878. The relation of the shape, direction, area and the height of the banks of the Hungarian Danubian islands was written in the style of the mid 19th century geographical view, with a lot of statistic descriptions. This article became obsolete almost in the moment it was published! It had been written before the large regulation works started on the Danube naming almost all (!) of the Danubian islands. This time islands still moved, changed their shape, direction, area and the height of their banks. Despite all, this work gives us a priceless snapshot on the state of the Danubian islands in 1878.
In this post we only discuss the most interesting part: the aspects of the islands area.