556 



SUM.MAKV OF CURRENT RESEARCHES RELATING TO 



siderable space for manipulation. The fine-adjustment is of the lever 

 type with two-sized knurled head for slow and rapid movement, ceasing 

 to operate when the objective touches the slide. The stage, covered 

 with vulcanized rabber, measures 102 mm. by 102 mm. The substage 

 consists of a mounting for the Abbe condenser and an iris diaphragm. 

 The condenser can be screwed up high enough so as to be used in 

 immersion contact with the slide. 



Pig. 95. 



Beck's '• London " Microscope.* — R. and J. Beck have just intro- 

 duced a new model of the well-known " London " Microscope (fig. 96). 

 The instrument differs from its predecessors mainly in being finished 

 with black enamel which is unaffected by acid or spirit ; also the stage 

 is 4 in. by 4 in. In other respects this instrument differs little from 

 previous examples, and like them is of moderate price. 



* R. & J. Beck's Special Catalogue, 1912. 



