iSS 



P/-IO TO-MICROGRAPHY. 



\_CH. VIII. 



the tube is removable almost to the nose-piece to avoid interfering with the size of 

 the image. The substage condenser should be movable on a rack and pinion. 

 The microscope should have a flexible pillar for work in a horizontal position. 

 While it is desirable in all cases to have the best and most convenient apparatus 

 that is made, it is not by any means necessary for the production of excellent 

 work. A simple stand with flexible pillar and good fine adjustment will answer. 



Fig. 144. 



Fig. 144. Leitg' Photo - Micrographic Camera for Vertical Microscope {from 

 Lettz* American House, New York). The camera may be raised or lowered to 

 adapt it to -canons stands. The microscope, as shown, rests on the base of the cam- 

 era support, thus aiding steadiness, and the simultaneous vibration of the entire 

 apparatus, if any should occur. 



With this instrument the focusing can be done with the hand on the fine adjust- 

 ment, as in ordinary microscopical study. 



