SCIOPTICON MANUAL. 197 



THE MAGIC LANTERN KALEIDOSCOPE. 



THE KALEIDOSCOPE was invented by Sir David Brew- 

 stcr, in 1814, and all who have witnessed the beautiful 

 effects produced by the instrument will welcome its 

 adaptation to the magic lantern, which, notwithstand- 

 ing the attendant optical difficulties, has at length been 

 accomplished. 



Fig. 56. 



The instrument is shown in section at Fig. 56; A being 

 a sectional view, showing the disposition of the mirrors; 

 B, an outline of the eight-celled image; (7, a side view 

 of the brass mount, containing the reflectors and lenses, 

 with sliding adjustment for focusing, and projecting the 

 image upon the screen. 



It is attached to the lantern by unscrewing the front 

 and screwing the kaleidoscope into its place, turning it 

 round in its sliding tube until the reflectors are upright, 

 like the letter V. A rack slide, containing some frag- 

 ments of colored glass, bugles, beads, and other trans- 

 parent objects, is also shown ; this is introduced into the 

 usual slide-holder of the lantern, and the focus adjusted 

 by sliding the kaleidoscope in or out until its back lens 

 is at a proper distance from the slide. 



In a former paragraph, the great importance of having 



