CH. I] 



SOME AMERICAN MAGIC LANTERNS 



FIG. 38 A. SIMPLE MAGIC LANTERN WITH TWO-LENS CONDENSER AND 

 A HAND-FEED ARC LAMP WITH RIGHT-ANGLED CARBONS 



AND WATER-CELL. 

 (Model 2, Delineascope. Cut loaned by the Spencer Lens Co.). 



FIG. 38 B. DETAILS OF MODEL 2, DELINEASCOPE. 



(Cut loaned by the Spencer Lens Co.). 



The entire instrument is in one metal box. 



At the left is the right-angled arc lamp with the feeding and fine adjustment 

 screws. 



The condenser is of the two-lens type with a water cell (W C) between the 

 lenses. 



.V P S 1 The slide-carrier is a flat frame on which the slides are laid and 

 turned to a vertical position by the crank L. 



S When the crank L turns a slide into position the one already in position 

 is released and it falls down the curved incline to S where it can be removed. 



L The projection objective. Its conical holder is hinged so that it can 

 be readily turned aside to give place to the projection microscope, which, in 

 the figure, is turned over on the top of the lantern box. 



