Abstract
IT was observed by Dr. C. G. Abbot that dust from the Alaskan volcano Katmai in June 1912 affected the transparency of the atmosphere in the northern hemisphere, but failed to influence the pyrheliometric observations at Arequipa, Peru. This led George G. Gallagher of Glendale, California, to inquire whether or not dust from southern hemisphere volcanoes influenced the atmosphere in the northern hemisphere. This matter has just been investigated by L. B. Aldrich from the records of the Smithsonian solar-radiation stations for the Chilean Andes eruptions of April 1932*.
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