ELEMENTARY PHOTO-MICROGRAPHY. 



The centres of camera, body tube, and hole in 

 object carrier must be accurately in line, so that no 

 after adjustments will be needed. When not in 

 use the whole thing is so light that it can be lifted 

 with one hand, and stowed away on a cupboard 

 shelf until it is wanted again, and its portable form 

 enables one to carry it from town to town for 

 purposes of practical demonstration with less in- 

 convenience than carrying a box of lantern slides. 



It will be understood that the remarks about 

 cost apply only to the framework, and not to 

 accessories. 



FIG. 7. 



LENS ADAPTER FOR CAMERA. 

 For taking photographs of large objects, such 

 as whole insects, no microscope is required. 

 Instead, an adapter for the camera is employed. 

 This is merely a ring of brass with screw thread 

 on its outside to fit the quarter-plate camera in 

 place of the usual photographic lens, and it has a 

 threaded hole in the centre to receive any low 



