ICONISMUS 1. illustration: A series of five horizontal panels labeled A through E, depicting various acoustic instruments or speaking trumpets (tubae stentorophonicae).

Panel A: Shows three separate components.

• Figure 1 is a small, slightly flared tube.
• Figure 2 is a long, straight trumpet with a wide bell and a mouthpiece.
• Figure 3 is a detailed view of a mouthpiece with a perforated screen or mesh.
  Panel B: Depicts a large trumpet with a single fold (folded back on itself once), featuring a wide bell and a mouthpiece.
  Panel C: Depicts a larger, more complex trumpet with a double fold (the tube loops back twice), resulting in a very long internal air column, ending in a wide bell.
  Panel D: Shows a straight trumpet similar to Panel A, but with a different mouthpiece assembly. To the right are two small diagrams (labeled with numbers 1-6) showing cross-sections or components of the mouthpiece/valve mechanism.
  Panel E: Depicts a long, straight, slender trumpet with a moderately flared bell and a simple cup-shaped mouthpiece.
  At the very bottom of the plate is a horizontal scale or ruler line with small tick marks.