CH. VIII} 



PHO TO-MICROGRA PH Y 



237 



FiG. 192. Buxton's Photo- Micrograp hie outfit for use with the arc light. 

 (Jour. Ap. Microscopy, igoi, p. 1367}. (Cut loaned by the Bausch & Lomb. Opt. 

 Co.) As will be seen from the figure this apparatus is for work in the horizontal 

 Position. The optical bench containing the microscope, water bath, color screen and 

 the electric light, swings sidewise sufficiently for the operator to arrange the speci- 

 men exactly as desired. It then swings back into position and is joined to the 

 camera. This is in two sections for either a short or long bellows. This seems to 

 be the most convenient of all the expensive outfits for photo-micrography . 



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

 (micro-metalloscope.) (German, Metallmikroskop ; French, Microscope pour 

 1' etude des surfaces metalliques et des objets opaque). (Fig. 193.) 



FIG. 193. Special microscope of the Boston Testing Laboratories for the study 

 and photography of metals and alloys (\ 381). (Cut loaned by the Boston Testing 

 Laboratories. ) 



