107 



PLACE OF OBSERVATION. 



Castleford 



Shipley 



Sklpton ...: 



Settle 



Penyghent , 

 Lancaster .... 

 K. Lonsdale . 



Horton 



Litton 



Gearstones . 

 Birkenhead . 

 Calderstone . 

 Lincoln 



Dip greater 

 or less than 

 that of the 



— 13-5 



— 7-4 



— 42 

 4-5 

 7-4 

 8-1 

 8-9 

 4-5 



+ 



+ 



+ 



+ 



+ 



+ 10.9 



+ 10-9 



— 14- 



— 9-9 



— 33- 



Calculation 



with the 

 mean values 

 of X and y. 



+ 



13 



6-7 

 0-7 

 4-6 



+ 7-4 



+ 

 + 

 + 

 + 

 ■f 



6-7 

 9-9 

 6-7 

 6-5 

 8-9 



— 7-1 



— 8-4 



— 33-6 



Difference. 



+ 0-5 



+ 0-7 



+ 3-5 



+ 01 



+ 

 + 



1-4 

 1-0 

 1-8 

 4-4 

 20 

 6-9 

 1-5 

 0-6 



In Table B, appear the results of a calculation made with 

 the mean values of x and y, applied to each of the places of 

 observation. The third column shews the difference between 

 the general calculation and the individual observations. The 

 differences are for the most part small, yet they exceed the 

 errors of observation, and indicate an effect of the great physical 

 features of Yorkshire in the direction of the Isoclinal lines. 

 They are represented on the map already referred to, by lines 

 passing from the several stations to distances proportioned to 

 the differences. These lines indicate the direction and extent 

 to which the Isoclinals must be shifted, to make them fit the 

 observations. 



On regarding attentively the map, it will be evident that in 

 all the district parallel to the normal, which is the great Vale 

 of York, the isoclinals require to be drawn with a loop retiring 

 southward from the general parallel ; but over the western 

 hills, and still more remarkably over the eastern hills, the line 

 must return somewhat sharply to the northward. The amount 

 of these deviations from the parallel must not be estimated by 

 single cases, but on the average ; and the result becomes more 



X 



