CH. VII] PROJECTION OF IMAGES OF OPAQUE OBJECTS i! 



FIG. losa. DIAGRAM SHOWING THE COURSE OF THE LIGHT RAYS FOR 

 TRANSPARENCY AND OPAQUE PROJECTION WITH THE RADIANT HORIZONTAL. 



(Cut loaned by the Bausch Of Lomb Optical Co.). 



A Upper carbon of the arc lamp. 

 B The first element of the condenser (fig. 3). 



C C Mirror horizontal when using lantern slides and inclined for opaque 

 projection. 



D Horizontal surface for opaque objects (20 x 20 cm., 8x8 in.). 



E Projection objective for opaque objects. 



F Mirror for reflecting the light to the screen and correcting the inversion. 



G Second element of the condenser for lantern slides. 



// Projection objective for lantern slides. 



N Support for condenser and bellows. 



Bellows. 



M Lathe bed on which move the various supports. 



what greater than the diagonal measuring the size of the picture, as 

 for lantern slides (see 314, fig. 114). A diverging beam could be 

 used by pushing the radiant within the focal distance, and a con- 

 verging by separating farther than the focal distance. Sometimes 

 there is no condenser but the radiant shines directly upon the 

 object (fig. 99, 100, 107). 



