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On the sign:
DEM ANDENKEN VON JOH PHIL NEUMANN 1774-1849 PROFESSOR AM POLYTECHNISCHEN INSTITUT
DEM DICHTER DER DEUTSCHEN MESSE VON FRANZ SCHUBERT
GEWIDMET VON DER TECHNISCHEN HOCHSCHULE UND VOM SCHUBERTBUND IN WIEN
The plaque on the wall of the concert hall in the Karlskirche is dedicated to the Austrian physicist and poet Johann Philipp Neumann, who was a close friend of the composer Franz Schubert. Neumann composed the text for Schubert’s German Mass.