ICONISMUS 1. illustration: A technical engraving divided into five horizontal registers labeled A through E, depicting various acoustic instruments or speaking trumpets (tubae stentorophonicae).

• Section A: Shows three components. Figure 1 is a short, straight conical horn. Figure 2 is a longer, straight conical horn. Figure 3 is a detailed view of a mouthpiece or an attachment with a mesh-like interior.
• Section B: Depicts a large horn with a single rectangular fold, where the tube doubles back on itself once before ending in a flared bell.
• Section C: Depicts a similar folded horn, but with a more complex, elongated winding and a larger flared bell.
• Section D: Shows a straight conical horn with a wide bell. To the right are two small diagrams (labeled with numbers 1-6) showing cross-sections or specialized mouthpieces/reeds.
• Section E: Shows a long, slender straight horn with a moderate flare at the bell and a distinct cup-shaped mouthpiece.
  At the very bottom of the frame is a horizontal scale or ruler line with tick marks.