Material: Brass

A fascinating mathematical tool, the Planimeter is used for calculating the area of irregular or uneven shapes in a plane.

Features and Description:

• Purpose: Primarily used by engineers, cartographers, and researchers, the planimeter helps to accurately measure the area of an irregular shape—such as the land area of a city or the surface of a biological sample.
• Design: The planimeter consists of two arms:
  • Fixed Arm: One arm is affixed to the paper using a pin, ensuring that the instrument stays in place while measuring.
  • Tracing Arm: The second arm contains a stylus, which is used to trace around the boundary of the shape or area being measured.
• Sliding Roller Drum: The planimeter features a sliding roller drum that rotates against the paper as the area is traced. This movement helps record the area measurement on a dial, offering precise readings.
• Wooden Box: It comes with a wooden box for secure storage, ensuring the instrument remains safe and protected when not in use.

Historical Significance:

• Origin: The planimeter was developed in 1854 by Jakob Amsler, a professor of mathematics at the University of Schaffhausen in Switzerland. His creation has since been used in various scientific fields due to its practical application for measuring irregular shapes.
• Wide Use: In addition to engineering and cartography, medical researchers also use planimeters for measuring biological phenomena, where precision is essential.