CH. IX a} 



PROJECTION MICROSCOPE 



26yf 



FIG. 214 



FIG. 214. Zeiss Epidiascope for Opaque Objects, and for Transparent Objects 

 in a Horizontal Position (Zeiss' Special Catalog}. 



As shown in this figure the apparatus is set up for opaque objects. For trans- 

 parent objects M 2 ( mirror 2) is removed when the light striking M^ is reflected to 

 M* and thence up through the object to M 1 and to the screen. 



Commencing at the right : R. Parabolic reflector, which projects the light from 

 the crater through ( W] the water bath to M 2 the mirror which is at the proper an- 

 gle for reflecting the light down upon the opaque object. From the opaque object 

 the light is irregularly reflected through the objective to M l . M 1 serves to reflect 

 the rays from the objective to the screen. 



V. Ventilator. M* and M* are mirrors for use in reflecting the light through 

 horizontal transparent objects. 



This apparatus is designed to project opaque objects as large as 22 centimeters 

 in diameter, at a magnification of 5 to 10 with a jo ampere current. For a smaller 

 object one may magnify as high as 25 diameters. With a 50 ampere current and a 

 larger reflector the magnification may be from 14 up to j/ diameters. 



