MCDIIM COr.TI.N'I-NTAL, THKEF.-FIFTHS ACTUAL SIZE. 

 Biiiiich and LoiiUi Optical Company. 

 A. ba^c .>r foot: B, pillar; C, arm, in it the sprins for the fine adjustment; D, body: 

 E. objective; F, draw-tube; G, eye-piece or ocular; H, mirror; I, sub-stage condenser: J. 

 stage; K, sliJe; L, fine adjustment: M, coarse adjustment. 



