December

Construction of the highest secular building in Europe (65m), the “Mühlenhof”, is completed in Cologne. The architect is Jacob Koerfer.
[Büttner, p. 783]

4 - 14 December

The first radio show (exhibition) is opened in Berlin by Reichspräsident Friedrich Ebert.
[Overesch/Saal, p. 239]

7 December

The stabilized situation in domestic and foreign policy is also reflected in the results of the Reichstag election. The moderate bourgeois parties and particularly the SPD win noticeably more votes than before. The radical parties lose a significant share of votes. Only the DNVP is successful again in the election. Despite victory for the SPD, attempts to build a grand coalition fail due to resistance from the DVP. Forming a government thus proves a very difficult task. No government coalition can be agreed upon until the end of the year.
[Büttner, p. 340]

17 December

After being pardoned by the Bavarian Minister of Justice Franz Gürtner, Hitler is prematurely released from prison.
[Büttner, p. 206 / Kolb, p. 354]

23 December

The erweiterte Schöffengericht (enlarged court of lay assessors) of the regional court in Magdeburg delivers its judgement in the libel trial of journalist Erwin Rothardt. Rothardt had previously accused Reichspräsident Ebert of high treason for his part in the Berlin munition workers’ strike in January 1918. Although Rothardt receives a three-month prison sentence for libel against the Reichspräsident, the court states at the same time that under criminal law, taking part in the strike was actually high treason. Rothardt is therefore found not guilty of slander.
[Winkler, p. 276]