CHAPTER III 



THE CAMERA AND PHOTOGRAPHIC 

 APPLIANCES 



A camera or its equivalent some arrange- 

 ment by which the sensitive plate may be held 

 in proper position to receive the projected 

 image from the microscope whilst securely 

 protected from all extraneous light is equally 

 important with the microscope itself. It may 

 be broadly stated at the outset that any 

 camera, no matter what its size or shape, 

 may be thus utilized provided it has a focus- 

 ing screen; without this it is of no use for 

 photo-micrographic purposes. At the same 

 time it may also be said that the majority of 

 "push the button" cameras are but little better 

 than makeshifts for photo-micrography. As 

 a rule their bellows are entirely too short for 

 general usefulness and must be added to in 

 some manner by the user. This is especially 

 the case with American boxes, though the 

 long extension forms which most makers have 

 introduced recently, go a long way toward 

 correcting this deficiency. I would earnestly 



(18) 



