SMALL CAMERAS 21 



to be made with the microscope, or for projection of the 

 image on to the white screen. 



Zeiss' Large Camera. The large apparatus made by 

 Zeiss is one of the most elaborate and complete outfits 

 made. The camera and optical bench are carried on 

 separate tables as indicated in Fig. 48. The chief 

 advantage claimed for this arrangement is that any 

 vibration given to the camera when moving the focussing 



Fig. 9 



SIMPLE BOX CAMERA 



screen or dark slide is not transmitted to the microscope, 

 and does not upset the adjustment. 



Small Cameras. There are many small cameras 

 made to slip on to the top of the microscope, and in- 

 tended for use without any further support. Some are 

 box-shaped and others conical, while the Gordon apparatus 

 made by Messrs. Beck is a brass tube with a chamber at 

 its upper end, in which a small plate is placed. The 

 simplest apparatus that w r e have ever used was made 

 from a small wooden box, the lid of which was removed 

 and flanges fixed so as to receive a focussing screen 



