Auxanometer
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An auxanometer (Gr. auxain, "to grow" + metron, "measure") is an apparatus for measuring increase or rate of growth in plants.[1]
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 has a pointer attached to it. When the plant's height increases, the pulley rotates and the pointer moves on a circular scale to directly give the magnitude of growth.[2]
Sensitive auxanometers allow measurement of growth as small as a micrometer,[3] which allows measurement of growth in response to short-term changes in atmospheric composition.[4] Auxanometers are used in the laboratory,[4] the field,[5] and the classroom.[6]
[edit] References
- ^
"Auxanometer". Encyclopædia Britannica (11th ed.). 1911. - ^ "Auxanometer". The New Student's Reference Work. Chicago: F. E. Compton and Co.. 1914.
- ^ Bovie, W. T. (1912), "A Precision Auxanometer", Botanical Gazette 53: 504, doi:
- ^ a b Ranson, S. L. (1955), "Experiments on Growth in Length of Plant Organs", Journal of Experimental Botany 6: 75, doi:
- ^ Gallagher, J. N. (1976), "A Sensitive Auxanometer for Field Use", Journal of Experimental Botany 27: 704, doi:
- ^ W. T. Bovie; W. T. Bovie (1915), "A Simplified Precision Auxanometer", American Journal of Botany 2: 95, doi:
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