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SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 78 



certainly real prevision on Mr. Clayton's part, and a gradual increase 

 in the accuracy of his forecasts. That the forecasts are not even 

 more close to the event than they are is due to several causes, not 

 least of which is the imperfect character of the Smithsonian solar 

 radiation observations. 



Our two stations in Arizona and Chile differed on the daily average 

 by about 0.5 per cent during the past two years. Clayton's researches 

 seem to demand a higher degree of accuracy than this. It can only be 



Fig. 23. — Mt. North Baldy from the road to the Table Mountain observing 



station. 



attained by small improvements in various parts of the observations, 

 by the improvement, if possible, of the existing stations, and by add- 

 ing new stations of the highest merit. 



All three of these improvements are in progress. A complete criti- 

 cal revision of methods of observation and reduction of solar radia- 

 tion observations is being made. Through Mr. Roebling's generosity, 

 the station at Harqua Hala, Arizona, is being removed to Table 

 Mountain. California, 2,000 feet higher. A year's observations at 

 Table Mountain prove that the sky conditions there will be decidedly 

 better and the living conditions for observers much more comfortable. 



Mr. Moore, the field director, has worked hard and successfully 

 to make the transfer to Table Mountain which involved buildings, 



