This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
FrakturZwangsligaturen. Mandatory ligatures in German blackletter typesetting The examples read Buchdruckerkunst art of book printing Setzkasten type case and Ma measure Note how some ligatures are maintained even in spaced setting They are ch ck tz and sz Note on the stligatures I'm not sure if the stligature in Setzkasten is set