( 887 ) 



The hourly means deduced froin these observations show. that 

 the inclination has the same value at 4 j>. m. as at 10 p. m. 

 This result, combined with the regular increase of the inclina- 

 tion from 10 a. m. to 5 p. m deduced from the first set of 

 observations, indicates that the inclination is a maximum at 

 about 7 p. m. 



Table IV contains the results of the third set of observa- 

 tions. It would be too long to give the individual observations : 

 therefore I merely communicate the hourly means for every 

 month and for the whole year. The fifth column of Table IV 

 contains the differences found when the value of the dip at 10 

 a. m. is subtracted from that at 4 p. m. 







TABLE IV. 







Number of days 

 of observation. 



10° a. m. 



4 p. m. 



Differences. 



December 



1868. 



9 



27° 19', 49 



27° 22'.52 



3'.03 



January 



1869. 



9 



27° 18'. 82 



27° 22'.59 



3'.77 



February 



ii 



8 



27° 19'.00 



27° 22'.50 



3'.50 



March 



» 



9 



27° 20'.76 



27° 24'.56 



3'.80 



April 



- 



8 



27° 22'.23 



27° 25M8 



2'.95 



May 



" 



9 



27° 21'.61 



27 () 24'.06 



2'.45 



June 



r/ 



9 



27° 22' .08 



27° 25'.32 



3'.24 



July 



» 



9 



27° 21'.51 



27° 25'.27 j 



3'.76 



August 



ii 



9 



27° 23M9 



27° 25'.58 



2'.39 



September 



it 



8 



27° 22'.68 



27° 25\69 ; 



3' .01 



October 



• 



8 



27° 23' 02 



27° 25 '.02 



2'.00 



November 



» 



8 



27° 23'.53 



27° 24'.90 



1'.37 



Annual Means. 





27° 21'.46 



27° 24'.42 



2'.96 



These observations show that throughout the whole year the 

 South Inclination at Batavia is greater at 4> p. m than at 1 1) 

 a. m. On 96 of the 1U3 days, on which the dip has been ob- 

 served at 10 a. m. and at 4 p. m., it was greater al 1 p. m. 

 than at 10 a. m. 



