84 



EIGHTH REPORT — 1838. 



reversed, and the observation was consequently complete. At 

 the other four stations Gambey's circle was not employed, and 

 we have to deduce from the observations with S 2 th^ dips that 

 would have been shown by a needle with the poles reversed. In 

 the report of the Magnetic Observations in Scotland, (B. A. re- 

 ports, vol. vi. page 98,) a correction for this purpose was de- 

 rived from a comparison of results obtained at Limerick with 

 S 2, and with a needle on Mayer's principle, used in a ciixle 

 of Nairne and Blunt's ; and we have here observations at eight 

 other stations, furnishing materials for a similar comparison 

 between the results of S 2, and of Gambey's instrument. 



Table XIX. 



