Sign reads, "Water-Power produced by sunlight, 4% total energy used by man." A demonstration of the process which creates hydroelectric power, beginning with the evaporation of water caused by the heat of the sun. The demonstration is presented at the California Institute of Technology in the 1920s or 1930s.
California Institute of Technology Universities and colleges--California--Pasadena Scientific apparatus and instruments Water-power--California--Pasadena Pasadena (Calif.)
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