206 Botanical Microtechnique 



The inexpensive Histoslide camera lacks the observation tube. 

 The object is focused through the microscope ocular and the camera 

 is carefully placed upon the ocular. In another model, the camera is 

 held on a bracket attached to the ocular tube, and the camera is 

 swung into position over the ocular (Fig. 17.1) . 



Pillar-Type Cameras 



A rigid and substantial type of apparatus carries the camera on 

 a vertical support, which is attached to a heavy base. Thus, the weight 

 of the camera is not carried on the microscope tube. A simple version 

 uses a bellows camera, without a lateral observation tube (Fig. 17.2) . 

 The latter camera may be used with a compound microscope or with 

 Micro Tessar lenses used directly in the shutter of the camera. 



Excellent work can be done with such apparatus if the component 

 parts are correctly aligned. However, it is obvious that the microscope 

 cannot be used conveniently for visual work when fastened to the 

 base of the camera shown in Fig. 17.2. The camera must be slid 

 vertically and the post swung back to permit use of the ocular. The 

 base is not large enough to hold the lamp, therefore separate pro- 



.^ gc3-^^i r— 



Fig. 17.2-Pillar-supiK)rlccl cameras: left, Bausch & Lonil) bellows camera on hinged 

 l)ill:n; ritrfil, Rinisdi J^: I.oinh fixcd-lcnglh camera with observation eyepiece. Camera 



swings on post. 



