POLARIZED LIGHT APPLIED TO THE MICROSCOPE. 
85 
POLARIZED LIGHT APPLIED TO THE MICROSCOPE. 
110. Polarizing apparatus. The apparatus employed for 
microscopic investigations with polarized light, consist of a 
Nicol’s prism placed below the stage and called jpolarizeT 
and an analyzer^ which is usually also a Nicol’s prism, set in a 
brass tube and inserted in the body of the microscope imme- 
diately behind the object-glass. 
The 'polarizer is so mounted that it can be revolved, allowing 
the polarizing planes of the two prisms to be made to coincide 
or to make with each other any required angle. These two in- 
struments together constitute the Polariscojpe, 
Fig. 47. Fig. 48. 
MOUNTING OF POLARIZING PRISM. MOUNTING OF ANALYZING PRISM. 
Figure 47 shows the mounting of the polarizer which is 
attached to the stage by a bayonet joint. The polarizing prism 
is revolved by turning the milled head at the bottom of the 
instrument. 
Figure 48 shows the mounting of the analyzer, which is in- 
serted in the lower end of the compound body, and attached by 
a bayonet-joint in the usual position of the object-glass, but 
passing upward into the body, the object-glass being attached 
to the lower end of the analyzer. 
Figure 49 shows a section of the polarizer and the form of 
mounting. Above and below the ISTicol’s prism are circles of 
thin glass to protect the delicate faces of the prism from injury. 
CATALOGUE OF ACHROMATIC MICROSCOPES. 
