Abstract
The construction and calibration of 2 portable radiometers, suitable for micrometerological studies, is described. One instrument measures the hemispherical short-wave radiation and the other measures directly the total radiative flux through a plane. Attachments to the latter instrument permit total hemispherical radiation and psychometric measurements to be made. Small dry batteries, a tiny motor, a simple Wheatstone''s bridge and thermistors are used.