Mercury Thermometer Illustration - Medical & Historical Temperature Measurement Tool #1852159 (License: Personal Use)

This black-and-white line drawing depicts a classic mercury thermometer, featuring a slender glass tube with a bulb at one end containing mercury, and a graduated scale marked in degrees Celsius or Fahrenheit. The design reflects mid-20th-century medical instruments before digital thermometers became widespread. Its simplicity highlights the functional elegance of analog temperature measurement tools.

Used on educational, historical, or medical websites to illustrate concepts like thermometry, healthcare evolution, or physics principles; matches user intent for learning about old diagnostic tools or comparing analog vs. digital devices.