IX, A, 1 



Wright and Smith: Radium Emanation 



75 



Table X. — Relation between the radium-emanation content a/tid meteoro- 

 logical conditions on Mount Pauad. 



Date. 



1913. 

 Apr. 22.. 

 Apr. 23.. 

 Apr. 24.. 

 Apr. 26.. 

 Apr. 26.. 

 Apr. 27.. 

 Apr. 28.. 

 Apr. 29.. 

 Apr. 30.. 



Majr 

 May 

 May 

 May 

 May 

 May 

 May 

 May 

 May 



1... 



2--- 

 3... 

 4... 



5... 

 6... 



7... 

 8... 

 9... 



May 10. 



Barometer. 



10 

 a. m. 



576.6 

 76.0 

 76.0 

 76.0 

 77.1 

 76.6 

 76.0 

 76.2 

 74.5 

 75.3 

 75.4 

 76.6 

 76.6 

 74.5 

 75.3 

 74.3 

 74.0 

 73.2 

 76.0 



p. m. 



jnin. 



576.0 

 75.5 

 75.3 

 75.5 

 76.0 

 76.0 

 74.5 

 74.5 

 74.0 

 74.0 

 74.5 

 76.0 

 75.3 

 73.7 

 74.0 

 73.5 

 73.5 

 71.5 

 75.3 



Humidity. 



10 

 a. m. 



P.ct. 



78.5 

 89.3 

 75.4 

 82.0 

 74.7 

 76.0 

 49.8 

 66.4 

 95.0 

 98.6 

 90.5 

 76.0 

 87.5 

 89.2 

 92.3 

 95.0 

 95.6 

 97.8 

 97.0 



4 

 p. m. 



P.ct. 

 99.9 

 89.3 

 93.0 

 81.7 

 78.4 

 76.0 

 96.5 

 88.0 



94.0 

 99.0 

 93.5 

 99.8 

 89.2 

 95.6 

 94.9 

 95.7 

 93.7 



Tempera- 

 ture. 



10 

 a. m. 



'C. 



17.8 

 18.5 

 18.0 

 18.5 

 19.2 

 20.3 

 21.0 

 18.7 

 15.8 

 16.0 

 17.5 

 18.0 

 18.5 

 19.0 

 16.4 

 15.3 

 13.5 

 12.2 

 13.6 



4 

 p. m. 



•C. 



15.3 

 17.5 

 15.3 

 17.5 

 16.0 

 18.0 

 16.0 

 15.0 

 14.0 

 14.7 

 16.0 

 15.0 

 15.0 

 15.5 

 13.8 

 14.0 

 12.0 

 13.0 

 14.2 



Weather remarks. 



10 a. m. 



Cloudy; showers. 

 Fair 



do -. 



do 



do... 



do 



do 



do -,- 



Partly cloudy 



Cloudy 



Pair 



do 



do.- 



do... 



Partly cloudy 



Cloudy 



do 



Heavy rain 



Cloudy; dense 

 fogr 



4 p. m. 



Emana- 

 tion per 



cubic 

 meter of 

 air ex- 

 pressed 

 in its 

 radium 

 equiva- 

 lent. 

 Grams X 



1012. 



Cloudy; showers . 



Cloudy 



do 



Showers 



Partly cloudy. .. 



Fair 



do.... 



Light showers.. 



Eain 



do 



Cloudy 



do 



Rain. 



Cloudy 



Partly cloudy... 



Rain 



do 



do 



Cloudy; fog . 



15.97 

 25.68 



36.42 



29.39 



42.68 

 14.81 



17.22 



24.96 



9.83 



24.34 



From the observations recorded in Table X, it is seen that 

 the variations of the radium-emanation content follow fairly 

 definitely the variations of the meteorological conditions, A 

 period of fair weather gives in almost every case comparatively 

 high values for the emanation while heavy rains are always 

 followed by a decrease. The two highest values; namely, those 

 for April 28 and May 3, respectively, were obtained after or 

 during periods of fair weather, while the lowest value, that of 

 May 8, was obtained during a typhoon with strong wind and 

 a heavy downpour of rain. 



It is to be regretted that the meteorological data at our 

 command is so meager, but since the nearest weather observatory 

 was 50 kilometers distant we had to depend on the readings of 

 the few instruments which we were able to carry with us. Data 

 on the velocity and direction of the wind would be especially 

 valuable. 



