114 



SIXTH REPORT — 183G. 



of the two cylinders. The first column, under the general head 

 of "Total Intensity," shows the ratios of the total force derived 



A sec S 

 from the mean horizontal component by the formula / = j^ ^^^ g; ; 



8' and h! being the dip and horizontal intensity in Dublin, and S 

 and h the same quantities at another station. The final column 

 contains the values in the preceding column multiplied by 

 1-0208. 



Table VI. 



Magnetic Intensity deduced by the Horizontal Cylinders. 



Dublin 



Helensburgh. . 

 Cambray .... 

 Loch Gilphead 

 Tobermorie . . 

 Loch Siapin . . 

 Artornish .... 

 Glencoe ... 

 Fort Augustus 

 Inverness .... 



Golspie 



Inverness .... 

 Gordon Castle 



Rhynie 



Alford ...... 



Braemar 



Blairgowrie . . 

 Newport .... 



Kirkaldy .... 



Melrose .... 



Dryburgh .... 



Helensburgh. , 

 Loch Ranza . . 

 Cambelton ., 

 Stranraer . > . . 

 Bangor ...... 



Dublin ...... 



The observed dips in Table VI. are the same as those in Table I. 

 with the exception of the dip in Dublin, at which station I have 

 availed myself, in addition to my own observations, of the nu- 

 merous results which Mr. Lloyd has obtained with several dip- 

 ping needles at the same spot where the cylinders were vibrated. 

 An abstract of all these observations from which the dip in 



