Fig. II - Vintage Scientific Diagram of Optical Instrument Apparatus #1413355 (License: Personal Use)

This black-and-white line drawing, marked “Fig. II,” depicts a circular experimental apparatus with internal structures such as a semi-circular reservoir (D), a central pivot point (R), and multiple labeled ports (E, O, H, N, C, S). The dual concentric rings suggest a closed-loop system, possibly for studying fluid flow, light refraction, or mechanical oscillation in early physics research. Annotations like “B” and “P” indicate measurement or adjustment points, typical of 19th-century scientific publications.

Used in historical science textbooks, museum digital archives, or academic articles on the history of physics and instrumentation; serves users researching vintage experimental methods, diagram interpretation, or the evolution of scientific illustration.