ritoioMicRocK.ti'iiy .ixn rr.cnxiL.ii. MicRdscorv 117 



|X)sition only. In precision work a stand must be stal)le and siil>- 

 stantial and the construction throughout has been arrangetl with this 

 thought in mind. The microsiopc is eiiuippeil with a movable stage 

 for rough focusing and this is fitted with a revolving mechanical stage 

 so that the specimen while under examination may be moved about 

 at will for the purpose of study or exploration. To facilitate focusing, 



Fig. 1". — .A vertical photomicrographic camera for transparent specimens. 



gear is provided so that the operator may sit at the ground glass 

 screen and by means of a wooden handle, focus the microscope. A 

 ground glass screen for viewing and for rough focusing and a clear 

 glass screen for fine focusing with a magnifier are provided to be 

 interchangeably mounted with plate liolders on the camera back. 



A second metallurgical outfit of Bausch and Lomb manufacture 

 shown in Fig. 14, is used for preliminary examination of specimens 

 while in the course of preparation and for photographing some metal- 

 lurgical specimens at medium powers. This outfit is also arranged 



