MAGIC LANTERN. 



77 



C, is fixed at the inner end of the double tube, 

 and a small convex lens D, at the outer end; 

 and to the fixed tube CE, there is joined a groove 

 EF, in which the sliders containing the painted 

 objects are placed, and through which they can 

 be moved. Each slider contains a series of figures 

 Fig. 5. 



or pictures painted on glass with highly trans- 

 parent colours. The direct light of the lamp G, 

 and the light reflected from the mirror MN, 

 falling upon the illuminating lens C, is concen- 

 trated by it so as to throw a brilliant light upon 

 the painting on the slider, and as this painting is 

 in the conjugate focus of the convex lens D, a 

 magnified image of it will be formed on a white 

 wall or white cloth placed at PQ. If the lens D 

 is brought nearer to EF, or to the picture, the 

 distinct image will be more magnified, and will 

 be formed at a greater distance from D, so that 

 if there is any particular distance of the image 

 which is more convenient than another, or any 

 particular size of the object which we wish, it can 



