626 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



raised sligttly, say about a quarter of an inch from the body of the 

 Microscope, and the binding screw is then tightened, securing the 

 weight of the camera, &c., upon the arm of the instrument, thus 

 removing any undue pressure upon the rack and pinion, or fine move- 

 ment of the tube, during future manipulation. The fine focusing 



Fig. 106. 



when completed leaves nothing to be done but to push the ground- 

 glass frame on till it is replaced by the plate-holder, when the picture 

 may be made. 



The features claimed for this apparatus are: "Its great porta- 

 bility, measuring when the draw-tube has been removed from the 

 cone, 4^ X 4^ X 9 in.; its ready application to the Microscope 

 in any position from the vertical to the horizontal, requiring but a 

 few minutes for its adjustment without changing the position or light, 

 at least for moderate powers ; its special fitness for the amateur, being 



