Understanding Crescograph: A Device for Measuring Plant Growth

Crescograph is a device used to measure the growth of plants, particularly root systems. It was invented by British engineer and scientist, William Cawthorne in the early 20th century. The device consists of a transparent tube filled with a growing medium, such as soil or sand, and a small chamber at one end where a seedling is placed. The tube is then connected to a graduated scale that measures the length of the stem and roots of the plant as it grows.

The crescograph allows researchers to study the growth of plants under controlled conditions, such as different light intensities, temperatures, and watering regimens. It has been used in a wide range of applications, including agricultural research, horticulture, and education. The device is still used today in some research institutions and universities, although it has largely been replaced by more modern technology such as digital imaging and computer analysis.