Historical Illustration of Ozone Testing Method #1491080 (License: Personal Use)

This black-and-white engraved illustration, labeled “Fig. 5,” shows a hand inserting a slender glass rod into a tall cylindrical glass container, likely containing potassium iodide solution-a common reagent for ozone detection. The setup reflects early chemical analysis practices from the late 1800s, where ozone’s oxidizing power was demonstrated by color change or starch-iodine reactions. The image conveys precision and methodical experimentation typical of historical laboratory protocols.

Used in educational or historical science content-such as museum exhibits, academic articles on atmospheric chemistry, or vintage lab equipment archives-to illustrate foundational ozone detection techniques before modern instrumentation.