812 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



the lifting power is central to the line of motion, thus preventing any 

 tilting. A new mechanical stage of extreme thinness has also been 

 added, the decrease of thickness having, it is claimed, been ob- 

 tained without any reduction of the solidity possessed by the former 

 stage, as it will bear manipulation of the movments and ordinary touch 

 of the fingers without showing any signs of deflection. The stage 

 allows of an inch of rectangular motion. 



Fig, 172. 



^ 



Verick's " Goniometrical Microscope for Mineralogy."— Tho 

 general design of this instrument (made in 1879) is shown in Fig. 172, 

 but the following specialties may be noted : 



