i6 



THE ART OF PROJECTING. 



The forms of lanterns differ somewhat as they are 

 adapted to different purposes, and they are called ster- 

 eopticons when the electric, the magnesium, or the 

 lime light is used in them. 



The electric lamp is generally placed within the lan- 

 tern box, which is made to accommodate either it, or 

 the lime light, as is most convenient or desirable. 



The magnesium lantern shown in Fig. 6 (p. 15) has 

 the lamp set into it behind, and resting upon a floor 

 which can be elevated or depressed by a thumb-screw. 

 The flexible tubing is connected with the chimney, and 

 the magnesia is thus prevented from distributing itself 

 throughout the apartment. 



Fig. 7. 



The above engraving (Fig. 7) represents the essen- 

 tial conditions for the lime light in a very convenient 

 form. Within the lantern may be seen the fixtures for 

 holding the lime and the jet, with the rubber tubing to 

 connect with the gas tanks. The front side and back 



