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BELLS, ALARMS,‘ AND ANNUNCIATORS 14:

The armature of the bell is shown in Figure 120. It is
made of a piece of iron having a steel spring riveted to

near; HEAD
I}; 030..

 
   
 

 

 

 

CORE MAG/Vi}? AND XO/ft'
FIG. 119. — Details of the Magnet Spools, and Yoke for
an Electric Bell.
it, as illustrated. The armature is fastened to a small block
mounted on the lower left-hand corner of the base.
A second block with a contact-point made from an or-

dinary brass screw by filing the end into the shape shown

END OF

.rn-ww mums: 'I'Wll'lllillvliflllf mmm'i l Immamm : 55R; w

 
 
   
 

 

 

     

i ML_

«83/355 BALL “mm” "was

.ARMA TURf
FIG. 120. -— Details of the Armature, and Contact Screw.

CONTACT 6‘6wa

in the illustration, is mounted on the base so that it is oppo-
site the end of the contact-spring fastened to the armature.
The gong may be secured from an old bell or alarm

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