CHAPTER VI, 

 PHOTO-MICROGRAPHIC APPARATUS. 



AFTEK what has been written about the component parts, 

 the entire system of apparatus ought to be easily understood. 

 No matter what microscope-stand or what light is to be used, 

 some ingenuity and care will be required to fit the several 

 parts together so that the action of the whole may be efficient 

 and sure. If a complete photo-micrographic apparatus be 

 bought ready for use, of course the purchaser, having once 

 satisfied himself of the accuracy and convenience of the 

 apparatus, need no further trouble himself on this score. 



Exceedingly good work has been done and may be done 

 again without any special apparatus beyond a microscope and 

 a camera. The microscope has only to be turned to the 

 horizontal, a camera run up to the eye piece end of the micro- 

 scope, all light not passing through the optical system excluded 

 by means of a velvet tube or cone passed from a photographic 

 lens tube, (the glasses being removed) to and over the end of 

 the microscope tube, the whole presenting an appearance 

 somewhat as shown in fig. 14. 



FIG. 14. SIMPLE ARRANGEMENT OF MICROSCOPE AND CAMERA. 



It need hardly be said that with such an arrangement great 

 care is necessary to prevent shaking, and to preserve the due 

 relation of parts. In all apparatus for this purpose two salient 



