From the book Hvem er Skrivekuglens Opfinder, written by Malling-Hansen's daughter Johanne Agerskov, we know how Malling-Hansen made experiments with a model of his writing ball made out of porcelain.
Together with her husband, Michael Agerskov, she was responsible for the ethic-religious, philosophic and scientific book, Toward the Light (in Danish, Vandrer mod Lyset!), first published by Michael Agerskov in Copenhagen in 1920.
Johanne Luise Heiberg | Michael Agerskov | Johanne Agerskov |