16 PHOTOMICROGRAPHY 



the stand made in accordance with that to which it is 

 best suited. 



Many vertical cameras are on the market which permit 



Fig. o 



VERTICAL CAMERA 



of^a varying bellow r s extension ; some of them are sup- 

 ported by two arms running on a single upright metal 

 pillar, and may be clamped at any desired position on 

 the pillar. These cameras are very convenient to use, 

 but have the drawback that unless very substantially 



