LANTERNS. 



17 



are provided with heavy black-cloth curtains which may 

 easily be raised to adjust the fixtures within, yet shut 



if -^« - 



Fig, 8. 



in the light when allowed to hang free. The con- 

 denser consists of three lenses, the front one being five 

 inches in diameter. This is shown in the cut (Fig. 8) 



AEVEBOJNB.&«l_ 



Fig. 9. 



of the transverse section of it. The objective repre- 

 sented is also compound. This form of lantern is made 



