W. W. Coblentz Thermopile
The Thermopile is one of the earliest devices used to measure radiant energy.  W.W. Coblentz introduced  a circular and linear thermopile and who then arranged for the Eppley Laboratory to produce them commercially. (1) Coblentz also made observations on the radiation from planets(2,3).
"W.W. Coblentz 1926 No. 169."

(1) www.epleylab.com/PrdLabThermopile.htm
(2) www.ulib.org/webRoot/Books/National_Academy_Press_Books/biographica.../bio154.html


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