Patented June 24, 1902. 



Fig. 85a. The Spencer L,ens Company's New Attachable 

 Mechanical Stage. Both movements may be operated by the 

 fingers of one hand, the milled heads being placed together at one 

 end with coincident axes. At the other end is a milled head for 

 the lateral movement so that either hand may be used therefor. 

 The center guide screw furnishes a stop for the slide carrier so 

 that the objective cannot be injured, 



