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APPARATUS FOR GROWING PLANTS UNDER CONTROLLED ENVIRONMENTAL CONDITIONS
Author(s) -
WILSON A. E.
Publication year - 1937
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1937.tb05063.x
Subject(s) - mist , humidity , air velocity , materials science , relative humidity , radiator (engine cooling) , air movement , environmental chamber , air humidity , mechanical engineering , mechanics , meteorology , engineering , chemistry , physics
SUMMARY Details are given of modifications of a Eothamsted Controlled Environment Chamber. These include an inexpensive cooling apparatus depending on the circulation of air through a car radiator through which cold or iced water is circulated by an electrically operated centrifugal pump. This apparatus enables temperatures down to 5° C. to be maintained at a room temperature of 16–18° C. Two types of humidifier are described. That finally adopted depends upon the passage of air through a fine water mist created by an atomizing device, the temperature of the water being maintained a few degrees above that of the air in the chamber. A method of drying air by passage over calcium chloride is described. Details of an inexpensive, simple and accurate, lineametric hair‐operated hygrostat are given. This instrument controls humidity within 2% Various minor modifications such as rough control of wind velocity within the chamber and a semi‐automatic watering device are described.