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APPARATUS TO MEASURE THE RATE OF FALL OF WIND‐DISPERSED SEEDS
Author(s) -
SHELDON J. C.,
LAWRENCE J. T.
Publication year - 1973
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1973.tb04416.x
Subject(s) - measure (data warehouse) , beam (structure) , wind speed , tube (container) , optics , physics , drift tube , acoustics , environmental science , materials science , meteorology , computer science , composite material , data mining , ion , quantum mechanics
SUMMARY Apparatus is described for accurately measuring the rate of fall of wind‐dispersed seeds over known distances. The detection system consists of photo‐electric beams at the open ends of a Perspex tube. The apparatus was connected to an automatic timing counter which was switched on by the released seed breaking the uppermost photo‐electric beam, and switched off as the seed passed through the lower beam. A simplified circuit diagram of the detection system is given.