I casually run into a strange spelling of German, I suspect it was just an experimental one. If you open a volume of the Zeitschrift für deutsches Altertum und deutsche Literatur of the 20s (for example here) you'll notice that not only it lacks capitalization of nouns, but even at the beginning of the sentences the capital letters were abolished. They were only used for proper names. An example is attached below. What I wish to ask is some reference to the history of this spelling: who was the proponent? how did it end?
Such a spelling was proposed by the Grimm brothers in the early 19th century. It gained some popularity among philologists, but unfortunately, it did not catch on.