BOWIE: ISOSTASY IN INDIA 



249 



TABLE 3 



To 



(lo-yo 



(Free Air) 



go"- lo 

 (Bouguer) 



g -y 



(Hay ford) 



1. Bhopal... 



2. Balianpur 



3. Kina 



4. Goona. . . . 



5. Lalitpur. . 



6. Sipri 



7. Jhansi. . . . 



8. Gwalior. . 



9. Dholpur. . 



10. Agra 



11. Muttra... 



12. Hathras.. 



13. Aligarh. . . 



14. Khurja. . . 



978.843 

 978.900 

 978.904 

 978.936 

 978.939 

 978.991 

 978.992 

 979.047 

 979.081 

 979.115 

 979.136 

 979.147 

 979.168 

 97^ . 194 



+0.020 

 +0.041 

 +0.017 

 +0.017 

 -0.013 

 +0.028 

 -0.002 

 -0.028 

 -0.028 

 -0.009 

 -0.012 

 -0.017 

 -0.036 

 -0.051 



-0.037 

 -0.021 

 -0.030 

 -0.038 

 -0.055 

 -0.026 

 -0.032 

 -0.051 

 -0.048 

 -0.028 

 -0.032 

 -0.038 

 -0.057 

 -0.074 



+0.013 

 +0.030 

 +0.017 

 +0.010 

 -0.010 

 +0.019 

 +0.005 

 -0.016 

 -0.013 

 +0.009 

 +0.007 

 +0.003 

 -0.015 

 -0.027 



term) as derived from gravity observations in the United States 

 is: 



70 = 978.038 (1 +0.005302 sin^ -0.000007 sin^ 2 «^) 



If this formula is used for the India stations we have the results 

 listed in table 3. 



Then the mean anomaly becomes: Without regard to sign: 

 Free Air, 0.023; Bouguer, 0.040; Hayford, 0.014. With regard 

 to sign: Free Air, -0.005; Bouguer, -0.040; Hayford, +0.002. 



Here we have a mean Hayford anomaly with regard to sign of 

 almost zero which is an indication that the Coast and Geodetic 

 Survey formula more nearly meets the conditions in India, within 

 the small area under consideration, than either of the two Helmert 

 formulas. 



The values at the different stations vary in size and sign and 

 therefore we seem to have local rather than regional departures 

 from the perfect isostatic state. The data, though small in 

 amount, indicate that isostasj^ may be nearly as perfect for large 

 areas in India as in the United States. We await with great 

 interest further reports on the important and valuable investi- 

 gations now being made in that country. 



