258 MAGNIFICATION IN MICRO-PROJECTION 



LARGE TUBE (Fig. 121) 



[CH. IX 



MAGNIFICATION AND SCREEN IMAGE OF VARIOUS OBJECTIVES AS FOUND 

 BY ACTUAL MEASUREMENT. 



First is given the magnification of the objective only, using the large tube 

 of the micioscope (fig. 121) ; then are given the magnification, etc., with am- 

 plifiers (fig. 126) and wuh oculars. With the latter the draw-tube is in place 

 (fig. 147, 172, 3913). 



