Auxanometer
Auxanometer (Gr."auxain"- "to grow" + metron, "measure") , an apparatus for measuring increase or rate of growth in plants. It automatically detects and measures plant growth and stores the information in a data logger.
In case of an arc-auxanometer(see picture), there is a wire fixed with the plant apex on one end and a dead-weight on the other. It passes over a pulley which had a pointer attached to it. When there is increase in height of the plant, the pulley rotates and the pointer moves on a circular scale to directly give the magnitude of growth.
References
- This article incorporates text from the Encyclopædia Britannica Eleventh Edition, a publication now in the public domain.
Source: adapted by the editor from Wikipedia, the free encyclopedia; from the article "Auxanometer". Image Credit.