CH. VIII-}, 



PHO TO-MICROGRA PH ) ' 



237 



Fig. 192. Buxton's Photo-Micrographic outfit for use with the arc light. 

 (Jour, Ap. Microscopy, 1901 , 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 

 l'etude des surfaces metalliques et des objets opaque ). ( Fig. T93. ) 



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

 and photography of metals and alloys {\ jS/). (Cut loaned by the Boston Testing 

 Laboratories. ) 



