124 



MAGNIFICATION AND MICROMETRY 



I CI I. IV 



sented graphically the fact that the size of the virtual image de- 

 pends directly on the distance at which it is projected, and this size 

 is directly proportional to the vertical distance from the apex of the 



Fig. hi. Figure shock- 

 ing the position of the mi- 

 croscope, the camera lucida, 

 the eye, and the difference in 

 size of the image depending 

 upon the distance at which 

 it is projected from from the 

 eye. (a) The size at 25 cm.; 

 (6) at 35 cm., (I 17S). 



Fig. 112. Wollaston's camera lu- 

 cida in position on the tipper end of the 

 tube of the microscope. (Cut loaned by 

 the Spencer Lens Co.) 



Fig. 113. Simple microscope mechanically supported by a lens holder. 

 One may obtain the magnifying power of a simple microscope by the use of a 

 camera lucida as with the compound microscope. (Cut loaned by the Spen- 

 cer Lens ( 'o. ) 





