THE DISCHARGER. 



627 



angular file, moistening the file with water or paraffin oil, and 

 then breaking the piece off. Both ends are somewhat rounded 

 off on the grindstone. A rect- 

 angular piece of sheet brass, 

 Omm. 5 thick, is softened in the 

 flame, and hammered upon a 

 round piece of wood or metal 

 into a cylinder wide enough for 

 the glass handle to fit into it 

 easily. The edges of the cylin- 

 der should overlap at the joint 

 about 2 mm . The joint is brushed 

 over with soldering liquid ; a 

 small piece of soft solder is 

 placed upon it and heated over 

 the spirit-flame until the solder 

 has well filled the whole length 

 of the joint. About half of the 

 inside of the cylinder is then 

 br ashed over with soldering 

 liquid, and the same is done with 

 the bent middle portion of the 

 wire, which is placed into the 

 cylinder; a piece of solder 

 about the size of a pea is laid 



inside upon the wire, and heat is applied until the solder has run 

 everywhere between the wire and the side of the cylinder, which 

 must be a little turned about for the purpose. The residue of the 

 liquid must be washed carefully away. To remove it from the inside 

 a goose-quill should be used, and any solder which has run upon the 

 outside should be filed away neatly. The cylinder being moderately 

 heated, the inner side next receives a coating of sealing-wax ; when 

 this is cold, the end of the glass handle is heated to the melting- 

 point of sealing-wax and pushed into the cylinder. 



The two arms of the discharger are finally bent into the form 

 given in the figure ; they may of course be bent farther apart or 

 brought nearer whenever required. 



In using the discharger it is held by the glass 

 handle, one knob is placed upon the external coating, 

 and the discharger so turned that the second knob can 

 be rapidly brought near the knob of the jar. A gentle 



FIG. 326 (1 real size). 



s s 2 



