CH. X] 



ERECT IMAGES IN DRAWINGS 



365 



mirror or prism with the objective, but point the objective directly 

 toward the screen. 



515. Erect images of horizontal objects with the episcope. 



Vertical drawing surface and vertical objective, horizontal object. 

 The object is placed with its upper edge away from the drawing 

 surface and the mirror reflecting the image to the vertical screen 

 will make it erect (fig. 211). 



516. Erect images on the drawing surface with the magic 

 lantern. (A) With an opaque, vertical drawing surface. Place 

 the transparency in the slide-carrier as described "for lantern slides 

 (fig. 7-8), i. e., with the object facing the light and wrong side up. 



(B) For a translucent, vertical drawing surface. Place the 

 object facing the objective and wrong side up. 



(C) For an opaque horizontal screen. Place the object so that 

 it faces the objective and the mirror or prism reflecting the rays 

 downward will give an erect image (see B and C in 514). 



ERECT IMAGES WITH THE PROJECTION MICROSCOPE 



517. Demonstration of the position of objects for erect 

 images. The simplest way to determine how a specimen should be 

 placed on the stage of the microscope to give an erect image on any 



FIG. 206. MAGIC LANTERN ARC LAMP AND TWO-LENS CONDENSER USED 

 IN MICRO-PROJECTION AND FOR DRAWING. 



(See fig. 146 for full explanation). 



