Mr. F. Guthrie on an Absolute Galvanometer 



297 



that there is repulsion between / and m, and also between m! and 

 /'. It is seen that the magnetic pair//' is fixed. The pair 



m m! is movable about a vertical axis. The system m m 1 is hung 

 by a metal or glass thread k from the rod /, which works stiffly 

 through the nut o. The latter carries an arm and vernier, jp, 

 which slides over the graduated head, q. The scale, nut. &c. 



