4 SMITHSONIAN INSTITUTION 



near it, Brukkaros was closed in November, 1931, and its outfit shipped 

 to Washington. Mr. and Mrs. Moore and Mr. and Mrs. Sordahl have 

 gone on to Egypt, where a test of Mount Saint Catherine, near Mount 

 Sinai, is to be made. 



Meanwhile regular solar-radiation measurements are being con- 

 tinued at Montezuma, Chile, and Table Mountain, Calif. 



Fig. 5. — Mr. Moore's observations in South West Africa. West Gansberg 

 taken from eastern part of peak. This mountain is about 7,600 feet high. 



The writer, after attending as delegate the Faraday and Maxwell 

 celebrations in England September 21 to October 2, 1931, and address- 

 ing the hundredth anniversary meeting of the British Association, 

 compared instruments at Potsdam. Twenty years ago the Smithsonian 

 Institution furnished to the Meteorological Observatory at Potsdam 

 one Abbot silver-disk pyrheliometer, standardized to the Smithsonian 

 scale for measuring solar radiation. Comparisons made in October, 

 1931, show no change above one-tenth of one per cent in the scale of 

 this instrument after 20 years of use. 



