PHANTASMAGORIC EXHIBITION. 83' 



sentation that had been previously made by the 

 magic lantern, it still laboured under several 

 imperfections. The figures were poorly drawn, 

 and in other respects not well executed, and no 

 attempt whatever was made to remove the optical 

 incongruity of the figures becoming more lumi- 

 nous when they retired from the observer, and 

 more obscure when they approached to him. 

 The variation of the distance of the lens D from 

 the sliders in E F was not exactly adapted to the 

 motion of the lantern to and from the screen, so 

 that the outline of the figures was not equally 

 distinct during their variations of magnitude. 



Dr. Thomas Young suggested the arrangement 

 shown in Fig. 6 for exhibiting the phantasma- 

 Fig. 6. 





goria. The magic lantern is mounted on a small 

 car H, which runs on wheels WW. The direct 

 light of the lamp G, and that reflected from the 

 mirror M, is condensed by the illuminating lenses 

 C C, upon the transparent figures in the opaque 

 sliders at E, and the image of these figures is 

 formed at PQ, by the object lens D. When the 

 G 2 



