ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 533 
The lantern with its apparatus can be rapidly erected. All parts are 
interchangeable, and only attached with one screw. No support is 
Fig. 71. 
required for an y apparatus outside the lantern. Support is obtained by 
straining-rods from portions which project far beyond the lantern case 
Fig. 72. 
to pillars attached at the top of the lantern. In other words, the same 
principle is employed which is now so much in vogue with bridges, 
i. e. the cantilever principle. 
