3* PHOTO-MICROGRAPHY 



that the camera may be easily lengthened or 

 shortened. 



If the camera can be placed on runners or 

 in a sliding groove to allow of its being moved 

 aside while the object is being illuminated 

 and adjusted in the microscope it will be a 

 decided advantage. 



This done, the front of the camera should 

 be brought up to the eye-piece end of the 

 microscope. The point of junction must be 

 made light-tight, and the whole fixed so that 

 the two instruments are, for the time being, 

 practically one. 



There will now be some sort of an image 

 on the ground glass, and a slight adjustment 

 of the focus ought to make that image sharp. 



A long rod or a cord can be placed along 

 the length of the camera and adapted to work 

 the adjustment-screw of the microscope in either 

 direction, as shown in the illustration (Fig. 8). 



For the low and medium powers a 

 focussing glass can be used with great advan- 

 tage, but with very high powers when the 

 image is dim the focussing can be better 



