130 



Proceedings of the Royal Irish Academy. 



No. of 



Magnetic 



Locality of Occurrence. 



Jointing. 



Bearing- 







419 



6° 30' 



E. 



Donabate Coast. 



431 



6° 30' 



E. 



jj 



442 



10° 30' 



E. 



jj 



443 



8° 30' 



E. 



Lough Shinney Coast. 



463 



5° 



E. 



5) ,, ,, 



491 



5° 



E. 



Gollerstown Bridge Quariy 



499 



7° 30' 



E. 



Raheny Quarry. 



516 



7° 30' 



E. 



Lucan. 



524 



8° 



E. 



Woodlands. 



Observations. 



Number of Directions observed, 34. 

 257° -:- 34 = 7° 33' mean value. True bearing, 13° 47' W. 



545 



12° 30' 



E. 



567 



8° 



E. 



568 



10° 30' 



E. 



569 



13° 



E. 



570 



12° 



E. 



571 



13° 



E. 



573 



8° 30' 



E. 



574 



13° 30' 



E. 



576 



12° 



E. 



577 



12° 30' 



E. 



578 



12° 30' 



E. 



Cork College Quarries. 



Note. — These directions are really pa- 

 rallel to those observed about 

 Dublin since — 



Diff. of Long., . . ._ . 20 i8' 

 Excess of magnetic varia- 

 tion overthatatDublin, 



Total Difference, 

 This added to mean direc- 

 tion for Dublin, .... 



Gives for Cork, . . 



2° 28' 



4° 45' 



7° 33 



18' 



Set of joints. 



Number of Directions observed, 11. 

 129° ^ 11 = 11° 43' E. True bearing, 12° 5' W, 



269 



15° 



E. 



Killester Quarry. 





271 



15° 30' 



E. 



MalaMde. 



— 



309 



14° 30' 



E. 



,, 



Set of joints. 



310 



14° 



E. 



,, 



— 



315 



13° 30' 



E. 



)» 



Set of joints. 



325 



14° 



E. 



,, 



Set of four joints. 



329 



12° 30' 



E. 



,, 



— 



344 



16° 80' 



E. 



,, 



— 



345 



13° 30' 



E. 



,, 







448 



13° 30' 



E. 



Lough Shinney Shore. 



Frequent. 



451 



13° 30' 



E. 



)j )) )) 



— 



458 



14° 30' 



E. 





— 



536 



14° 30' 



E. 



Leixlip. 



— 



537 



16° 30' 



E. 



,, 



— 



Number of Directions observed, 14. 

 201° 30' -f- 14 = 14° 23' E. mean value. True bearing, 6° 57' W. 



342 



19° 30' 



E. 



347 



17° 30' 



E. 



350 



19° 



E. 



388 



21° 



E. 



404 



20° 



E. 



444 



18° 30' 



E. 



