LANTERNS AND THEIR MANIPULATION 119 



which shows one fitted with shutter for the curtain effect, 

 (p. 122), and telescopic mounts. In nearly all cases the top 

 lantern is made removable, as here represented, so as to be 

 useful as a single lantern, and allow the remainder to be 

 packed lighter, as a bi-unial. 



With the exception of the dissolving apparatus, there is 



Fid. 66. Tri-unial Lantern 



little to add about the tri-unial. The object of the third 

 lantern is solely to allow of further dioramic effects, with sets 

 of slides made to exhibit such in combination. For instance, 

 dissolving into a snow scene may be done with two nozzles ; 

 but to do so combined with the effect of falling snow, can only 



