90 SCIOPTICON MANUAL. 



or diamonds, say a fourth of an inch in diameter, and 

 covering them with bits of colored gelatine, or by simply 

 using the tinters of the Sciopticon, many curious effects 

 in complementary colors may be obtained. 



FAIRY FOUNTAIN. The effect of what is known as the 

 tl Fairy Fountain " can be prettily illustrated in the fol- 

 lowing manner : A small table fountain is placed at a 

 distance of about four feet in front of the lantern ; by 

 curtains or otherwise the lantern is then hidden from 

 the spectators, so that they see only the fountain illumi- 

 nated by the rays coming from the lantern. When the 

 fountain is made to play, every drop seems transformed 

 into a diamond, and by passing colored glass in front of 

 the lantern the effect is striking and beautiful; but when 

 the rays from a bisulphide of carbon prism are allowed 

 to fall on it, then is the best effect produced. 



THE KAINBOW. A card with a curved slit, one-six- 

 teenth of an inch (Fig. 29), will throw on the screen a 



simple semicircle of white 

 light; but when a prism 

 is held in front of the ob- 

 jective, the bow at once 

 assumes all the natural 

 colors of the rainbow. As 

 the direction of the rays 

 is changed, the range of 

 mg ' 29 ' the instrument has to be 



elevated, to bring the bow upon the screen. By using 

 two lanterns, projecting a view with one and the bow 

 with the other, a very natural effect may be produced. 



A MAGNET AND IRON FILINGS. Fix a small magnet 

 to a glass slide, and carefully arrange a funnel opening 



