THE IMAGINARY RANGE AND TROUGH. 



51 



Table 11. — Gravitation effect of the compensation only of the Ima- 

 ginary Range (I) according to the Hayford tables and (II) on the 

 hypothesis of support by flotation, using Fisher's constants. All 

 quantities negative and expressed in dynes. 



Station. 



Hayford Compensation. 



Fisher Constants. 





— 20 



•350 



•310 





— 10 



•305 



•280 





— 5 



•200 



205 





— 4 



•180 



•185 





— 3 



•155 



•165 





— 2 



•130 



•140 





— 1 



•105 



•115 









•075 



•085 





+ 1 



•045 



•060 





+ 2 



•130 



•040 





+ 3 



•020 



•025 





+ 4 



•015 



•015 





+ 5 



•010 



•010 





positive anomaly, increasing at stations further into the hills till, 

 on the plateau, it rises to as much as -f- *040 dyne. 



In the table No. 12 are given the gravitation effects of a com- 

 pensation supposed to have a uniform depth of the centre of com- 

 pensation of 25, 35, and 45 miles respectively, which shows the 



Table 12. — Gravitation effect of the compensation only of the Ima- 

 ginary Range supposed to be centred at various depths. All 

 quantities negative and expressed in dynes. 





Depth of < 



centre of Compensation. 



Station. 









« 



25 miles. 



35 miles. 



45 miles. 



— 20 



•380 



•330 



•300 



— 10 



•345 



•295 



•265 



— 5 



•235 



•200 



•180 



— 4 



•210 



•180 



•160 



— 3 



•180 



•155 



•140 



— 2 



•150 



•130 



•115 



— 1 



•120 



•105 



095 







•085 



•080 



•075 



+ 1 



•060 



•055 



•055 



+ 2 



•040 



•010 



•040 



+ 3 



•025 



•025 



•030 



+ 4 



•015 



•015 



•020 



+ 6 



•010 



•010 



•015 



[ 199 ] 



