American astrophysicist and fifth secretary of the Smithsonian Institution, Charles G. Abbot (1872-1973, right) with a half horse-power solar boiler. Abbot is best known for his research in solar energy and inventing the solar boiler, solar cooker and solar still. Photographed in the South Yard behind the Smithsonian Institution Building, Washington D.C., USA on 30th September 1936. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / COPYRIGHT STATUS UNKNOWN / SMITHSONIAN INSTITUTION |
Taille de l’image : | 3327 px × 2639 px |
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