THE ELECTRIC BELL. 



727 



which allow the handle of the hammer and the bar which 

 carries the bell to pass through. 



When h and i are connected with the terminals of a 

 battery a complete circuit is established. The current, 



LIBRAE! 



I UNIVERSITY 



CALIFORNL 



FIG. 366 (an.proj.; real size). 



supposing i to be connected with the positive pole, 

 passes from i round the bobbins e l and e^ from e 2 to /i, 

 through the armature a to / 2 , and thence through s and 

 m to A; if h be connected with the positive pole the 



