240 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



in having an eye-piece with two lenses only, instead of three, although 

 the presence of a screw-thread seems to indicate that provision for this 

 third lens had been made, which, however, is not essential for the pro- 

 duction of a good image. 



The spring-clip to the stage is fixed on the upper side, instead of the 

 under side — a much better position. 



The mirror is plane, and under \% in. hvdiameter (less in diameter 



Fig. 35. 



than a sixpence). It can be used for illuminating opaque objects by 

 inserting the stem in the socket seen to the right-hand of the stage. 



The object-glasses are three simple lenses, which may be used singly 

 or in combination. By removing the body the instrument can be used 

 as a simple Microscope. 



Zeiss's New Laboratory Stand.*— This instrument (fig. 36) is 

 intended for use in the laboratory, and for demonstration purposes. One 



* Carl Zeiss's Special Catalogue, x. (1904). 



