566 ADDITIONS. 



thus lead the impression by any path to any distance, and increase its 

 force in any degree, has led to this combination, and almost identifi- 

 cation, of observation by touch with its record by galvanism. 



The method having been first used by Mr. Bond at Cambridge, in 

 North America, has been adopted elsewhere, and especially at Green- 

 wich, where it is used for all the instruments ; and consequently a col- 

 lection of galvanic batteries is thus as necessary a part of the apparatus 

 of the establishment as its graduated circles and arcs. 



END OF VOL. L 



