SCIOPTICON MANUAL. 161 



receive attention in the following pages, in connection with 

 the Lime-light Sciopticon. 



THE LIME-LIGHT SCIOPTICON. 



The unrivaled excellence of the Oil-light Sciopticon con- 

 sists in its serving us, not with a lime-light equivalent, but 

 with flame at its brightest, arranged at its best, and in its 

 being always available with but trifling expense and 

 trouble. 



Without interfering with this special arrangement, an in- 

 tense light may be used in it, as explained on the preceding 

 page ; but the distinctive Lime-light Sciopticon, Fig. 43, 

 drops the flame-chamber, and takes on parts peculiar to 

 itself. To have the full advantages of both arrangements, 

 therefore, requires two instruments ; but if the lenses and 

 draw-front are not duplicated, the two involve but little 

 extra cost. (See appended catalogue.) 



Fig. 43, page 1G8, shows the exterior of the Lime-light 

 Sciopticon, the internal arrangement being indicated by 

 dotted lines. Comparing it with the preceding, or with 

 Fig. 15, page 30, it is seen that the wooden base, the lower 

 and front part of the cylindrical body, the condensing lenses 

 with their peculiar mounting and attachment, the draw- 

 front with hood, opaque curtain, tinters and objective, are 

 precisely the same, and so cull for no further description 

 here. An obvious difference is the absence of the lamp, 

 flame-chamber and chimney, leaving a vacant chamber for 

 the triple jet and the automatic winker. The peculiar cut- 

 off called the winker, and the slide frame, which is an appen- 

 dage of it, will receive attention further on, in closer con- 

 nection with Figs. 43 and 44. 



TRIPLE JET ADJUSTMENTS. 



The Triple Jet described page 158, Fig. 40, enters its 

 chamber freely, Fig. 43, and is kept in place with sufficient 



