-. 



100 OLDHAM: THE STRUCTURE OF THE HIMALAYAS, ETC. 



extending to a depth of 1 13*7 km.; secondly, the effect of the attraction 

 of the Siwalik plateau, where it exists ; and, thirdly, the effect of the 

 Gangetic trough, using in each case the cross-section which has 

 been adopted in Chapter IV as most appropriate to the position of 

 each station. The combined effect of these three separate causes is 

 given as the deflection, normal to the range, which should be expected 

 at each station. This deflection requires a further correction, as 

 the general course of the range varies, at the different stations, from 

 nearly east and west to nearly north-west and south-east, and, 

 before the calculated deflections can be compared with those actu- 

 ally observed in the meridian, it is necessary to make an allowance 

 for the direction of the course of the range at each station. This 

 has been done in table No. 29, where the calculated deflections, in 

 the meridian, are compared with those actually observed by the 

 Great Trigonometrical Survey and the difference given in the last 

 column, a minus sign meaning that the northerly deflection, which 

 is found at every station, is in excess, and a plus sign that it is in 

 defect of the calculated deflection. 



Table 29. — Latitude Stations in the Himalayas, 



Station. 



Distance 

 from main 

 boundary. 



Calculated 

 Deflections. 



— 18 



1 



Observed 



■ Deflections. 



Difference. 



Kidarkanta .... 



40 







— 26 



— 8 



Lambatach .... 



36 



— 18 



— 30 



— 12 



Bahak .... 



26 



— 22 



— 24 



— 2 



Bajamara .... 



18 



— 24 



— 24 







MuKsooree .... 



8 



— 35 



— 32 



+ 3 



Banog .... 



8 



— 35 



— 29 



+ 6 



Raj pur .... 



0& 5 



— 42 



— 44 



— 2 



Biroiul .... 



2 



— 38 



-40 



+ 2 



Kaiilia .... 



32 



— 21 



— 29 



— 8 



Mahadco 1'okra 



30 



— 22 



— 34 



— 12 



Phallut .... 



32 



— 24 



— 33 



— 9 



Tonglu .... 



20 



— 28 



— 38 



— 10 



Senchal .... 



9 



— 36 



— 31 



+ 5 



Kurseong 



4 



i 



— 44 





— 3 



In interpreting these figures it must be remembered that the 



observed deflection at any station may depart from the average 



deflection, at a similarly situated station on an average range, by 



L 248 ] 



