

PREFACE. 



YISIBLE illustrations are so highly esteemed among 

 educationalists of the present day, that the announce- 

 ment that a greatly improved form of Magic Lantern has 

 made its appearance is very favorably received. 



Between a desire for such an instrument, and the lack 

 of definite information concerning it, many very natu- 

 rally manifest both their interest and their caution by 

 searching letters of inquiry. The inventor has en- 

 deavored, in hasty epistles, to state all the possibilities 

 and impossibilities of the Sciopticon, and of lights, lenses, 

 lantern slides, and tanks; but he finds it increasingly 

 difficult to give each correspondent, individually, a full 

 philosophical exposition. For such, therefore as desire 

 a, more detailed account than can be given in a hasty 

 letter, or than is contained in the circular, which it is 

 always a pleasure to forward on application, a Sciopticon 

 Manual has been prepared, to serve as a guide-book to 



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