i8 



THE ART OF PROJECTING. 



The oil lanterns have various names given to them 

 by different makers, such as magic lanterns, lampo- 

 scopes, sciopticons, and so on. Fig. 10 represents 

 Marcy's Sciopticon. On the opposite page are cuts of 

 an oil lantern, and an oxyhydrogen lantern with micro- 



m g . 10. 



scope attachment for physical experiments, both by 

 Queen & Co.; the latter one is called a physical pro- 

 jector, and it is adapted to a wide range of work. But 

 little time will be needed to learn all that is needful to 



