238 PHOTO-MICROGRAPHY [CH. VIII 



For great magnification Zeiss recommends the use of the com- 

 pensation oculars with the apochromatics. 



The Zeiss projection oculars may be used with achromatic ob- 

 jectives of large aperture as well as with the apochromatics. 



NEGATIVE RECORD 



Name No. Location 



Camera Date 



Exposure 







Objective Developer 



Ocular Fixer 



Condenser Mag. X ._. 



Diaphragm . 



Object Stained with. 



Color Screen 



Plate 



Light and Hour 



Remarks 



PHOTOGRAPHING OPAQUE OBJECTS AND METALLIC SURFACES 

 WITH A MICROSCOPE 



All of the objects considered in the first part of this chapter are opaque 

 and some of them were to be photographed somewhat larger than natural size. 

 *To meet the needs of modern work, especially with metals and alloys one 

 must be able to examine and photograph prepared surfaces at magnifications 

 ranging from five or ten to five hundred or more diameters. 



\ 317. Microscope for Opaque Objects. If one does not need to magnify 

 more than about 100 diameters, any good microscope will answer. For the 

 higher powers it is far more convenient to employ a special microscope for 

 metallography (micro-metalloscope.) (German, Metallmikroskop; French, 

 Microscope pour 1'dtude des surfaces me"talliques et des objets opaque). 



