CH. I] MAGIC LANTERN WITH DIRECT CURRENT 



33 



on the ceiling above, but by means of another mirror at 45 degrees 

 or a prism this vertically directed light is reflected horizontally to 

 the ordinary vertical screen (fig. 16, 4aa). (For projection with 

 the vertical microscope see 397). 



FIG. 1 6. ARRANGEMENT OF THE MAGIC LANTERN FOR HORIZONTAL 

 OBJECTS. 



(Cut loaned by C. H. Stoelting Co.). 



Commencing at the left the parts are : 

 L Hand-feed lamp with right-angled carbons. 

 H Lamp -house cut away to show the lamp within. 

 / 2 Adjusting screws to move the carbons, 

 j 4 Screws for centering the crater. 



5 Adjusting screw for moving the lamp toward and from the condenser. 

 C The plano-convex lens of the condenser next the radiant. It here gives 

 a parallel beam. 



T Water-cell in the path of the parallel beam. 



42a. In England and America this is often called vertical projection from 

 the position of the objective; in Germany it is called horizontal projection 

 from the position of the object. 



