330 The adaptation of the Aneroid for Surveying in India. [No. 4. 



Comparison betwixt the Standard and Aneroid Barometers made at 

 the Observatory y Colaba, betwixt January and December, 1850, with 

 the range of each, showing the remarkable diminution of the Aneroid 

 in the Course of the Year, 





Barometer. 



Range. 



Aneroid. 





Month. 



Max. 



Min. 



Max. 



Min. 



Range. 



January, 1850. 



7th, 



8th, 



9th, 



10th, 



11th, 



12th, 



13th, 



14th, 



15th, 



16th, 



17th, 



18th, 



19th, 



20th, 



21st, 



22nd, 



23rd, 



24th, 



25th, 



26th, 



27th, 



28th, 



29th, 



30th, 



31st, 



29.980 

 .922 

 .856 

 .861 

 .929 

 .908 



.875 

 .910 

 .931 

 .919 

 .914 

 .930 



.9*80 

 .941 

 .930 

 .929 

 .960 

 .957 



.953 

 30.003 



.015 

 29.994 



29.839 

 .780 

 .720 

 .742 

 .798 

 .800 

 .791 

 .755 

 .790 

 .798 

 .795 

 .805 

 .797 

 .896 

 .842 

 .833 

 .810 



.833 



.833 

 .844 

 .844 

 .844 

 .892 

 .880 



.141 

 .142 

 .136 

 .119 

 .131 

 .108 



.120 

 .120 

 .133 

 .124 

 .109 

 .133 



.138 

 .108 

 .120 



.127 

 .124 



.109 

 .159 

 .123 

 .114 



29.90 



.85 

 .81 

 .80 

 .88 

 .93 



78 



.80 

 .85 

 .82 

 .82 

 .83 



.88 

 .84 

 .81 

 .81 

 .81 

 .87 



.87 

 .85 

 .90 

 .90 



29.80 

 .72 

 .69 

 .70 

 .70 

 .71 

 .70 

 .66 

 .69 

 .71 

 .72 

 .74 

 .74 

 .80 

 .75 

 .75 

 .71 

 .70 

 .72 

 .75 

 .75 

 .75 

 .80 

 .80 

 .80 



.10 

 .13 

 .12 

 .10 



.18 



.22 



.12 

 .11 

 .14 

 .10 



.08 

 .09 



.13 

 .09 

 .10 

 .11 

 .09 

 .12 



.12 

 .05 

 .10 

 .10 



