96 



THE MICROSCOPE. 



cross-bar (Ji) of which is a groove, in order that the ob- 

 server may enjoy the luxury of applying a Malt wood's 

 iinder, as in larger instruments possessing moveable stages. 



«* a 



Fig. bO. — Collins' s Binocular Mio'oscojie. 



Beneath the stage is seen the polariser (p), fitted into the 

 circular diaphragm. The double mirror (m) possesses a 

 triple joint, so that it can be applied obliquely in all 

 directions. 



Collins's Student five-guinea Binocular ^Ticroscopc con- 

 sists of two eye-pieces, rack adjustment, top-sliding stage, 

 wheel of diaphragms, concave mirrors with adjustments, 

 axes for inclining to any angle, tweezers and glass plate, 

 1 in. and -^ in. achromatic objectives, C series. Packed 



