O'Eeilly — On Jointing in Rochs about Lublin, ^r. 129 



Classifying these directions, and separating them into east and 

 west magnetic directions, the following results are obtained : — 



No. of 

 Jointtng 



Magnet 

 Bearing 



ic 



LOCALITY OF Occurrence 



273 



Nm. 



gm. 



Malahide Station Quarry. 



274 



3° 30' 



E. 







)> J) 



275 



1° 



E. 







J) )) 



276 



Ifm. 



Sm. 







35 5 J 



277 



3° 



E. 









278 



Xm. 



gm. 







3) 3) 



279 



4° 



E. 









282 



3° 30' 



E. 







)J 3) 



287 



4° 



E. 









290 



N- 



gm. 







3) 33 



323 



2° 30' 



E. 







Shore. 



365 



Km. 



gm. 







33 



374 



N-"- 



gm. 









411 



N""- 



gm. 



Donabate Coast. 



429 



2° 30' 



E. 



J 





437 



2= 30' 



E. 



J 





465 



2° 30' 



E. 







496 



2° 30' 



E. 



Worthiiigton Quarry. 



541 



2° 30' 



E. 



Leixlip 





553 



2° 30' 



E. 



Felt 



rim 



Quarry. 



0BSER\'ATI0NS. 



The magnetic Tariation for 

 Dublin, 1883, is taken at 

 "W". 21° 20', as deduced 

 from Admiralty Chart. 



Number of Directions observed, 20. 

 36° 30' T 20 = 2° 4' mean value. True bearing, 19° 16' W. 



264 



9° 



E. 



219 



7° 30' 



E. 



320 



4° 30' 



E. 



321 



5° 30' 



E. 



324 



7° 30' 



E. 



327 



5° 30' 



E. 



328 



8° 



E. 



333 



8° 



E. 



354 



7° 30' 



E. 



362 



7° 30' 



E. 



366 



7° 30' 



E 



371 



7° 30' 



E 



392 



10" 30' 



E 



393 



7° 30' 



E 



394 



6° 30' 



E 



396 



7° 30' 



E 



401 



7° 30' 



E 



403 



7° 30' 



E 



405 



7° 30' 



E 



406 



8° 30' 



E 



402 



12° 30' 



E 



413 



9° 30' 



E 



414 



10° 30' 



E 



415 



7° 30' 



E 



418 



7° 30' 



E 



Malahide. 



Frequent. 



Five joints. 

 Frequent. 



Donabate Coast. 



Frequent. 



Very fi-equent ; so frequent 

 as to be practically count- 

 less. 



