5<D SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 65 



the first ascension, as shown in the accompanying chart [not here shown], 

 indicates an altitude of 25,600 meters at the time one of the balloons burst. 



Very respectfully, 



C. F. Marvin, 



Chief of Bureau. 



temperatures at different altitudes in balloon ascension, 

 July ii, 1914, p. m. 



Time Altitude Pressure Temp. Remarks 



p. m. 



mm. 



°C. 



4:02 312 732.0 33.1 Balloon launched. 



500 33-2 



4:04.4 631 706.4 33-3 



4:07.3 962 681.0 29.8 



1,000 29.7 



4:11 1,503 640.1 26.0 



2,000 21.7 



4:18.2 2,493 l 7-5 



3,000 14-0 



3,5oo 10.8 



4:25.3 3,645 9-9 



4,000 # 9-6 



4:28.8 4,447 9- 1 



4,500 8.6 



4:32.2 4,976 431.5 4-8 



5,ooo 4-7 



6,000 — 1.7 



7,000 — 7-9 



4:44.1 7,592 309.9 —11 -5 



8,000 —13-4 



4:46.8 8,597 280.5 —16.0 



4:49 8,930 265.3 —17-9 



9,000 — 18.3 



10,000 —24.8 



4:55.1 10,442 220.3 — 27.6 



11,000 — 31-8 



5:01.8 11,572 185.5 —35-9 



12,000 — 38.7 



13,000 — 45-2 



5:08.7 13,348 145-5 —47-0 



14,000 — 48-8 



S:i37 14,641 — 52.0 Lowest temperature. 



15,000 — 51-5 



5:15.7 15,026 —51-5 



5:19.2 15,457 —48.3 



16,000 — 48.3 



5:22.4 16,855 —48.3 



17,000 — 46-6 



5:24.3 17,106 — 45.2 Clock stopped. 



5:28 18,164 Balloon burst. 



