1G6 



The mean isodinal, therefore, crosses the meridian at an 

 angle of 70°-31 — E. of North; and the normal to it, (the line 

 of maximum increase of dip) lies 4'| to the East of the 



magnetic meridian. 



These results of calculation are represented on the accom- 

 panying map, by parallel lines drawn at intervals of 10'. of dip, 

 crossed by the normal through the central point. 



Table B. 



PLACE OF OBSERVATION. 



Newcastle . , 

 Carlisle ...., 



Penrith 



High Force ., 



Croft 



Lazenby 



Whitby 



N. Allerton .. 

 Osmotherley 

 Hambleton ., 

 Scarborough ., 



Thirsk 



Helmsley ..., 



Craike 



Malton 



York 



Flamborough 

 Bridlington ., 

 Doncaster .... 

 Harrogate...., 



Sheffield 



Pocklington .. 



Arras 



Selby 



Burton , 



Howden 



Hull 



Dip greater 

 or less than 

 that of the 



+ 24-7 

 + 35-1 

 + 30 

 + 19-1 

 + 13-8 

 + 10-3 

 + 5-3 

 + 7-5 

 + 10 

 + 11 

 — 7-2 



+ 

 + 

 + 



+ 



6 



5-5 

 2-8 

 4-7 



— 5-0 



— 15-3 



— 11-4 



— 23-5 



— 1-7 



— 21-9 



— 8-9 



— 12-5 



— 11-4 



— 8-4 



— 15-4 

 •— 15-8 



Calculation 



with the 

 mean values 

 of X and y 



+ 27-7 

 + 34 

 + 25-8 

 + 21-8 

 + 11-6 



+ 11 

 + 6-1 

 + 6-9 

 + 7 

 + 11-7 

 — 1-3 



+ 3-1 

 + 2 

 -- 0-4 



— 3-6 

 -- 6-9 



— 7-8 

 -- 7-3 



— 20-7 



— 3-6 



— 22-9 



— 9-8 

 — 13-1 

 — 13-1 



— 12-5 



— 15-1 



— 18-3 



Difference. 



+ 



3-0 

 M 

 4-2 

 2-7 

 2-2 

 0-7 

 0-8 

 0-6 

 3-0 

 0-7 

 5-9 

 2-9 

 35 

 32 

 0-9 

 1-9 

 5-8 

 4-1 

 2-8 

 1-9 

 1-0 

 0-9 

 06 

 0-7 

 41 

 0-3 

 2-5 



