732 



THE ELECTRIC BELL. 



to the proper dimensions with the file. Into one end of it a small 

 hole is drilled lengthways, and at the other end a cut is made, also 

 lengthways, with the metal saw ; two holes are also drilled through 

 the end where the cut is, and are both of them slightly countersunk 

 at both sides. For the sake of clearness in fig. 369 the keeper 

 is drawn in section, and the remaining parts in outline. For the 

 hammer a piece of brass wire, 6 mm thick and 12 mm long, is cut, 

 and a hole is drilled through it at the middle of its length. Into 

 this hole one end of a piece of brass wire, 2 mm thick, is soldered ; 



FIG. 369 (^ real size). 



the other end of it is fastened with solder into the hole at one end 

 of the keeper. Two strips of thin sheet brass are cut, each 6 mm 

 wide, made elastic by hammering, and provided with the necessary 

 holes for fastening them. They are put both together into the slit 

 at the end of the keeper, and secured by two brass rivets. A piece 

 of brass wire, which is just thick enough to pass tightly through 

 the two holes in the keeper, is heated in the flame, and two pieces 

 are cut off" it, long enough to project on each side about O mm> 5 

 when pushed into the holes. They are passed through the holes 



