42 OLDHAM: THE STRUCTURE OE THE HIMALAYAS, ETC. 



and published by Major H. L. Crosthwait. 1 In Table No. 5 a 

 list of these stations is given, together with their distances from 

 the main boundary fault, and the deflections which were calculated 

 for the actual station, as well as those at stations similarly situated 

 on the Imaginary Range, allowance being made for the departure 

 of the actual range from a due east and west direction. La each 

 case the values are given (I) for the supposition that the visible 

 masses are uncompensated and (II) for the supposition that the 

 compensation is in accordance with Mr. Hayford's tables for uniform 

 compensation to a depth of L13'7 km. Finally there is given the 

 difference between the value for the Imaginary Range, and for 

 the actual topography on each supposition, or the amount of de- 

 flection, northerly or southerly, which the latter gives as compared 

 with the former. 



Table 5. — Comparison of deflections due to the actual topograph//, 

 with those due to the Imaginary Range, at stations similarly 

 situated, allowing (I) for the effect of the risible masses and (II) for 

 the same as modified by the effect of 11 ay ford compensation. 









Deflections 





DitTeren e 





1 >i lance 



due (o the 



Deflections 



between the 



Station. 



from 



main 



Imaginary 



calculated 



effec 



of 





houn 



clary 



Range, in 



by Major 



actual 



and 





in miles. 



the meri- 



Crosthwait. 



imaginary 









dian. 





topography. 









1 11 



1 II 



1 



II 



I.ambataeh .... 



44 



N. 



— 33 — 14 



— 71 — !) 



— 38 



5 



Kurseong .... 



3 



» J 



— 64 — 29 



— 103 — 23 



— 40 



(i 



Mussooree .... 



3 



*» 



_40 — Mt 



— 8(> — 17 



— 4f> 



+ 2 



Birond .... 



2 



• » 



— 51 —20 



— 74 — 14 



— 23 



+ 6 



Dehra Dun .... 



li 



8. 



— 34 — 17 



— 8t> — 18 



— 52 



+ I 



Siliguri .... 



12 



" 



— 30 —13 



— 84 — 1 1 



— 54 



+ 2 



Jalpaiguri .... 



33 



>> 



— 14 — 6 



— 77—8 



— 63 



+ 3 



Kaliana .... 



41 



>> 



— (J — 2 



— 58—3 



— 52 



+ 1 



It will be seen that the uncompensated deflections derived from 

 Major Crosthwait's calculations show a large northerly deflection, in 



1 Investigation of the Theory of Isostasy in India : Survey of India, Professional 

 Paper No. 13, Dehra Dun, 1912. In addition to the results published in this paper, I 

 am indebted to the courtesy of Sir S. G. Burrard, Surveyor-General, for the details of 

 the calculations from which they were obtained. 



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