14 

 Modifications in the Triple Jet. 



A platiua tip for the mixed jet is now made interchange- 

 able with the steel nipple. It is less liable to become rough- 

 ened in the bore by oxidation, and less liable to burn should 

 it accidentally come in contact with the incandescent lime. 

 In case obstructions carried by the current get too tightly 

 lodged in the narrow passage to be removed in the hurry 

 of an exhibition, the difficulty may be quickly overcome by 

 removing the tip and screwing in its place one of the spare 

 nipples furnished with the instrument. This peculiar 

 nipple, though it has gone out of use as a gun nipple, is 

 the only one I have been able to find that well answers 

 this purpose. 



The aperture in the platina tip is moderately large, as is 

 now generally approved. When, however, the strongest 

 light is desired, it is common to give still larger vent to the 

 mixed gases, with great pressure to counteract the increased 

 tendency to ignite inside the jet. 



For the alcohol burner, a peculiar limeholder, which 

 has been before alluded to, may be used. Price $1.00 The 

 ordinary socket is removed, and the tube holding this lime 

 holder slips down over the wick tube, communicating its 

 heat to the alcohol, thus favoring its vaporizing. It also 

 tends to kep the flame from following an accidental over- 

 flow. For the alcohol limelight to be at its best, a full 

 supply of good alcohol and a plenty of wick is required. 



Attached to each liraeholder is a brass strip, bent in the 

 form of a sugar tongs, to facilitate turning the lime. 



The metallic sheathing over the base of the jet keeps it 

 from becoming defaced by the heat, or by handling. 



In the draw under the draw-front of the Sciopticon is 

 kept the wrench, broach, extra nipples, lead washers, etc. 



