FIGS. 75, b, c. New Fine Adjustment of Leitz. The movement is produced 

 by a cam rotating on a fixed axis (/). The cam is moved by a worm wheel (d) 

 which engages the thread of an endless screw (a] from two sides (Fig. 75). 



One complete turn of the endless screw (a] produces an adjustment of i-ioth 

 mm. By means of the graduated drum (r), on the axis of the screw, one can 

 easily read i-iooth of a revolution and thus determine an adjustment of i-ioooth 

 mm. Cuts loaned by Wm. Krafft, N. Y. 



