Description: [caption id="" align="aligncenter" width="430" caption="The Division of Radiation and Organisms Laboratory, located in the basement of the Smithsonian Institution Building, a division of the Smithsonian Astrophysical Observatory dedicated to studying the effects of solar radiation on organisms. Shown here is a vacuum type thermocouples of very high sensitivity, used in
Description: [caption id="" align="aligncenter" width="410" caption="The Division of Radiation and Organisms, located in the basement of the Smithsonian Institution Building (SIB), Shown here is apparatus for studying phototropism (bending toward light) of seedlings, in connection with experiments to determine effects of wave lengths of light on growth, Date unknown, by Unidentified