Phofomicrography 207 



Fig. 17.3-Combination visual and photomicrographic apparatus, permanently as- 

 sembled on commercial (B & L) metal base. The home-made plywood camera swings 



on a post and can be removed. 



vision must be made to fasten the lamp rigidly at the proper distance 

 from the microscope. In order to do both visual and photographic 

 work, the user spends much time tearing down and reassembling the 

 components of the apparatus. 



The swing-out type of camera permits free use of the microscope 

 for visual work, and the camera can be swung into position accurately. 

 The lateral observation tube permits precise focusing (Fig. 17.2) . 

 A compact and rigid unit can be made by bolting a length of channel 

 iron to the metal base of either style shown in Fig. 17.2, and fasten- 

 ing the lamp permanently to the channel iron. 



Combined Visual-Photographic Apparatus 



Experienced research workers know that the taking of a photo- 

 micrograph is inseparably associated with critical visual study. For 

 example, let us assume that a wet acetocarmine preparation has been 



