Report on the Solar Eclipse Expedition to Sakdol. 



Before beginning, the following comparisons were made with a 

 standard thermometer No. 93,638 by Casella : 



Standard read 78'6 



Dry bulb 77'9 



Wet 78-0 



correction 



Maximum 

 Minimum 



78-0 

 78-0 



+ 0-7 

 + 0-6 

 + 2-6 

 + 0-6 



The wet and dry bulb thermometers, and the barometer with its 

 attached thermometer, were read every half hour from 5 A.M. till 

 8 P.M. or later. The maximum thermometer was read at 4 P.M., the 

 minimum at 10 A.M. 



On the day of the eclipse, observations were made of wet and dry 

 bulb and barometer, and also of the standard thermometer (Caseila 

 No. 93,638) every five minutes. 



The barometer was very steady throughout our stay, near 28' 6 in. ; 

 and it seems scarcely necessary to publish the details. 



The wet and dry bulbs both followed very closely the curves 

 shown in the attached diagram, the deviations from the curve seldom 

 exceeding a degree or two. To avoid needless printing, the follow- 



5 6 7 8 9 10 II 12 I 2 3 4 5 6 7 6 3 10 II 



Hour of Day. 



c 2 



