160 SCIOPTICON MANUAL. 



THE OIL-LIGHT SCIOPTICON, WITH THE TRIPLE JET. 







The jet may take the place of the oil lamp, Fig. 42, with- 

 out changing the construction of the Sciopticon It is not 

 so convenient for the jet as the form shown in Fig. 43, but 

 its original peculiar advantages are not sacrificed. With 

 the Sciopticon complete, as illustrated and described at 

 page 30, we remove the back flame-chamber glass G' t the 

 narrow strip F, the chimney cap J, and the oil lamp 8. 



Fig. 42. 



With the lime light the front glass G is only useful to pro- 

 tect the condenser ; if retained, it should be glass without 

 the cut as commonly used, or else clear mica. With a con- 

 centrated light every blemish shows upon the screen. 



Removing the lime holder from its socket we insert the 

 blow-pipe by dipping the jet under and into the flame- 

 chamber, and letting the lime with its holder down the 

 open chimney into its place again, as shown (Fig. 42;. 



The lime, spaces, and lenses, and the adjustments pecu- 

 liar to the alcohol, the concentric, and the mixed jet, will 



