Classic Laboratory Flask with Thermometer - Scientific Instrument Illustration #100157 (License: Personal Use)

This black-and-white line illustration depicts a traditional round-bottom laboratory flask containing liquid, with a calibrated thermometer inserted through a cork or rubber stopper. The setup suggests use in thermal experiments, such as reflux, distillation, or reaction monitoring, where precise temperature control is essential. The detailed shading and cross-hatching evoke 19th- or early-20th-century scientific textbooks.

Commonly used in educational content about historical lab equipment, chemistry curricula, museum exhibits on scientific instrumentation, or articles comparing past and modern lab practices; targets students, educators, and history-of-science enthusiasts.