566 ADDITIONS. 



thus lead tlie 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. I 



