28 



Report on the Magnetic Survey. 



[No. 1. 



meters long, was attached to the floaters so as to give as little resist- 

 ance as possible to their progress. 





Vel 



ocity of the L 



*rahmaputra. 





Points and total 



depth. 



(See plan and 



Velocity, 

 meters in 1 second. 





Sur- 



Depth of 



Depth of 





section.) 



face. 



7.5 m. 



10 m. 





Pt. la, 











depth 12.5 m. 



1.28 







This water was 

 stopped by the 

 island Oomma- 

 nand behind 

 which the velo- 

 city was 0. 



Pts. 1, 2, 3,.... 



Velocity 0, a little motion at 

 about 30 m. from the shore, at 

 43 m. the vel. and depth the same 

 as at pt. 4. 





Pt. 4 











depth 17.1 m. 



1.30 



1.20) Mean 



1.10) Mean 



A very good 







[ 1.22 



[ 1.09 



point, full stream, 







1.24) 



1.08) 





Pt. 7 











depth 17.8 m. 



1.42 



1.30) Mean 



1.20) Mean 



Also quite re- 







1.30 [ 1.30 



1.23 [ 1.21 



gular full stream. 







1.28) 



1.21 ) 





Pt. 9 











depth 14.0 m. 



1.15 



1.20) Mean 



130.) Mean 



The lower cur- 







[ 1.22 



[ 1.31 



rents here are 







1.25) 



1.32) 



more rapid owing 

 to a tendency of 

 the water to flow 

 in the deep chan- 

 nel indicated by 

 sounding, No, 8, 



Pts. 10, 11,12,.. 



Very slow motion, protected by 

 a spur of the Ceela hill. 





Note. — The motion becomes at about 50 meters distance from 

 the right shore. 



No. 5. — Quantity of water. 

 In the present state of the river, approaching pretty nearly its 

 minimum of water, only the surface of the section of the main 



