Abstract
Direct recording of evaporation from crops or other natural surfaces, continuously over long periods, has till now been practicable only by means of elaborate weighed lysimeters or possibly, for large enough uniform sites, by sophisticated eddy correlation techniques. The present instrument adapts the wellknown Bowen-ratio method so as to combine the sensing and computing functions into one relatively simple package. It utilises a servo-balanced bridge technique to give a continuous output proportional to the evaporation rate at a low height above the surface, and suitable for conventional recorders or integrators. Trials with an early pilot-model have shown a very satisfactory daytime performance, with only minor modifications required to improve the performance at night.
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