During the past decade important advances have been made in the measurement of light and radiant energy. Although previous to this time emphasis was placed on the refinement of instruments for measuring light, during this period emphasis has been placed on the measurement of radiant energy since plants are affected by rays both longer and shorter than those of the visible spectrum.
Proceedings of the Iowa Academy of Science
©1936 Iowa Academy of Science, Inc.
Aikman, J. M.
"The Radiometer: A simple Instrument for the Measurement of Radiant Energy in Field Studies,"
Proceedings of the Iowa Academy of Science, 43(1), 95-99.
Available at: https://scholarworks.uni.edu/pias/vol43/iss1/10