1851.] The adaptation of the Aneroid for surveying in India. 339 





Barometer. 



Range. 



Aneroid. 





Month. 



Max. 



Min. 



Max. 



Min. 



Range. 



December, 



16th, 



17th, 



18th, 



19th, 



20th, 



21st, 



22nd, 



23rd, 



24th, 



25th, 



26th, . . 



27th, 



28th, 



29th, 



30th, 



31st, 



30.069 

 .067 

 .025 

 .046 

 .064 

 .058 



.061 

 .021 



.018 



.003 

 .041 



.051 

 29.985 



29.934 

 .931 

 .912 

 .933 

 .923 



.951 

 .924 



.880 

 .914 



.889 



.914 

 .917 



.852 



.135 

 .136 

 .113 

 .113 

 .141 



.137 



.104 

 .114 



.134 

 .133 



29.83 



.84 

 .83 

 .84 

 .85 

 .85 



.85 



.84 



.84 

 .86 



.85 



.87 

 .84 



29.82 

 .82 

 .80 

 .80 

 .83 



.82 

 .81 



.80 

 .80 



.81 



.82 

 .81 

 .80 



.01 

 .02 

 .03 

 .04 



.02 



.04 



.04 



.05 



.06 

 .04 



The following observations have been sent to me by Capt. Thuillier, 

 Deputy Surveyor General of India. 



Comparison of an Aneroid Barometer, No. 3064, by Dent, with the 

 standard in the Observatory at Calcutta. 



Days. 



Time of Observa- 



Standard 



Attached 



No. 3064 



Difference 



tion. 



Bar. 



Ther. 



An. Bar. 



of Bar. 



March 23 



Sunset 



30.070 



88.8 



30.066 



.004 



„ 24 



Sunrise 



.096 



69.3 



.087 



.009 





9 h. 50 m. 



.206 



89.2 



.200 



.006 





Noon 



.184 



93.7 



.175 



.009 





2 h. 40 m. 



.110 



95.7 



.104 



.006 





4 P. M. 



.096 



96.2 



.087 



.009 





Sunset 



.080 



90.2 



.066 



.014 



„ 25 



Sunrise 



.100 



72.0 



.092 



.008 





9h. 50 m. 



.198 



84.5 



.187 



.011 





Noon 



.178 



91.3 



.172 



.006 





2 h. 40 m. 



.108 



94.3 



.100 



.008 





4 P. M. 



.082 



95.2 



.079 



.003 





Sunset 



.066 



90.0 



.062 



.004 



„ 26 



Sunrise 



.088 



71.8 



.087 



.001 





9 h. 50 m. 



.184 



85.3 



.183 



.001 





Noon. 



.166 



92.7 



.166 



.000 





2 h. 40 m. 



.0.98 



97.0 



.100 



* .002 





4 P. M. 



.084 



97.3 



.085* .001 



2 Y 



