MICROSCOPES FOR USE IN CHEMICAL LABORATORIES 29 



are sent through the preparation upon the stage by means of 

 the mirror M. The analyzer consists of a prism sliding in and 

 out of the microscope tube at A. In the illustration the dotted 



FIG. 7. Simple Form of Hot-stage Microscope. Polarized Light is obtained by 

 Reflection from the Plates P and R and the Mirror M as indicated by the 

 Dotted Arrows. A = Analyzer. B = Small Gas Burner which swings under 

 the Stage Opening. 



lines indicate the approximate direction of the light rays used 

 to illuminate the object. When moderate temperatures are 

 necessary the objective must be cooled by means of a blast 

 of air directed upon the lower lens, and when high temperatures 

 are employed the objective must be water-jacketed. 



