The measurement of the intensity and the colour of the light in woods by means of emission and rectifier photoelectric cells

Abstract

For many years past the subject of plant distribution in relation to the illumination of the site has been of interest to botanists. Results obtained using photochemical and photographic methods have been summarized by Wiesner (1907) and by Riibel (1928). Dorno (1919, 1928) has studied the measurement of daylight by a variety of methods. Klugh (1925, 1927) has given a general review of recent literature, and described a photographic method with a neutral wedge and rhodamine B paper.