41 



The small mechanical stages specified under 3 and 4 are fastened to the prism 

 flange of the stand (Fig. 17 and 18), they are designed for use on Stands IV a and IV b 

 and can be attached to those stands without special adaptation. They may also 

 be directly attached to Stand II a , but the revolving movement of the stage is in 

 that case suspended. 



Fig. 18. 

 Small Mechanical Stage, No. 47, attached to Stand IV*. 



('/ Full Size.) 



