I just added this caption and image to the Trombone History Timeline (19th century, 2nd half). It reflects the long tradition of wind instruments, including trombones, playing from towers, a practice that probably continued longest in Germany and in Moravian congregations. This particular image may be an attempt to represent an earlier age.

1883—Munich, Germany: Thurmbläser, a print by Carl Schultheiss, features a group of trumpets and trombones performing from a tower (see below image; public domain) (Illustrirter Katalog der internationalen Kunstausstellung im Königl, September 1883).