50 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1933 



OTHER FIELD STATIONS 



The volcanic eruption in southern ChUe early in the year 1932 

 having temporarily spoiled the atmosphere for observing at Monte- 

 zuma, we took advantage of the break in continuity of observations to 

 improve the apparatus hj substituting pyrheliometers of the newest 

 type, a new pyranometer with improved sun shade, and have under- 

 taken to revise the method of computing in accordance with the latest 

 method developed at Table Mountain. These extensive alterations 

 in apparatus and procedure prevent the working out of the solar- 

 constant values until the method is fully complete and tested. When 

 that occurs the values from the Montezuma station will be available 

 back to about the middle of the year 1932, leaving a break of only 

 2 or 3 months when the volcanic ash was at its maximum. 



Meanwhile telegraphic observations have been received from the 

 station at Table Mountain and communicated to interested parties 

 as heretofore. They are not regarded as of so high a degree of 

 accuracy as those formerly obtained from Montezuma and are 

 regarded, furthermore, as provisional values subject to revision when 

 all the evidence becomes available. 



PERSONNEL 



M. Keith Baughman was employed as bolometric assistant at 

 Table Mountain from November 21, 1932, to May 31, 1933. A. F. 

 Moore returned from detached service to be director at Table Moun- 

 tain. Harlan H. Zodtner and Frederick A. Greeley were released 

 from duty at Table Mountain for detached service on the Mount St. 

 Katherine Expedition. 



SUMMARY 



Valuable progress has been made on the study of the dependence of 

 terrestrial temperature departures on the variation of the sun. Inter- 

 esting studies have begun on the dependence of terrestrial tempera- 

 ture departures on the ozone content of the atmosphere; solar- 

 radiation observations have been continued at Table Mountain, 

 Calif., Montezuma, Chile, and the cooperating private station at 

 Mount St. Katherine in Sinai Peninsula is being equipped. A new 

 radiation measuring instrument of highest sensitiveness called the 

 kampometer has been devised and used with success in preliminary 

 measurements of the extreme infrared solar spectrum. 



Respectfully submitted. 



C. G. Abbot, Director. 

 The Secretary, 



Smithsonian Institution. 



