44 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 65 



JULY I, I914. NIGHT ASCENSION 



Balloon launched with No. 5 pyrheliometer at 1 i h 26 m p. m. in clear 

 sky. Moon half full and setting. Wire, 22 meters long, plus 3 

 meters, plus 2 meters. Total, 27 meters. Electric flash light 

 attached, but could be followed only a few minutes with theodolite 

 at Fort Omaha, and was not seen from the second station. The 

 apparatus was found July 3, 6.30 a. m., at Harvard, Iowa, two bal- 

 loons still inflated. The instrument was somewhat damaged, but the 

 record not harmed. 



JULY 9, I914 



Balloon launched with No. 4 pyrheliometer at io h 8 m a. m. Bal- 

 loons followed by theodolites at both stations for i h 5 m , and at one 

 station for 2 h i6 m . One balloon burst after 42'", another after 2 h 4™. 

 The apparatus was found at Omaha after 20 days, but the record was 

 spoiled by light and water, and the instrument greatly damaged. 



july 11, 1914 



Balloon launched with No. 3 pyrheliometer at io" 30" 1 a. m. Sky 

 fairly clear, save for cirri near the horizon. All clear near the sun. 

 Balloons followed by theodolites at both stations for 35 minutes, and 

 at one station for over two hours. Two balloons burst nearly 

 simultaneously, after i h 47™. Pyrheliometer A. P. O. 9 was read 

 immediately after the launching as follows: At io h 35 m , 1.147 cal. ; 

 at io h 39™, 1. 161 cal. Apparatus found 3)^ miles northwest of 

 Carson, Iowa, on July 11, at 5 p. m., and received entirely uninjured 

 at Mt. Wilson, California. It was later carried uninjured to Wash- 

 ington, and tested in various ways during the following winter. 



Weights of apparatus and accessories : 



Grams 



Three balloons, at 2,880 grams each 8,640 



Pyrheliometer 1,250 



Water in jacket 170 



Silk, feathers, and cotton wrapping 370 



Wire 50 



Total • 10,480 



DISCUSSION OF RECORDS 

 I. THE NIGHT RECORD 



In figure 8 is given a reproduction of the record obtained in the 

 night flight made at Omaha on July 1, 1914. A x A 2 A s A± is the 

 barometric record, B ± B 2 B z the pyrheliometer record. As shown, 





