76 On the Municipal Electric Telegraph, 
weighted arm'a@ falls over until stopped by the adjustable. rest 
in front of it. In falling, a little lever, seen attached to the 
, 9. tit 
sen/ 
ee 
a. DEGIDNCED E GED EG 
same axis, raises the latch-shaped detent d, by means of the pit 
connected with it. The arm carrving the pin e, attached to the 
same axis with the cam g, and connected with the train of wheels 
of the striking machinery, is thus liberated, and commences t@ 
revolve on its axis. In go doing the cam g¢ swings forward the 
pin eis arrested at the end of one revolution, | This qccupies two 
seconds, and in the meantime the weight of perhaps 2000 Ibs 
cing the electro-magnet, was interrupted. This indefinite and 
undesirable mode of striking would be produced by holding dow? 
the Alarm Key at the Central Office. To obtain single pet 
, m ‘ 
momentaril y at suitable intervals, which is best effected by meals 
of the District Key-board. The fly-wheel of the clock work is - 
