858 SUMMAEY OF CUBRENT RESEARCHES RELATING TO 



Fig. 182. Fig. 183. 



Reichert's Mineralogical-Geological Microscope. — This, fig. 184, 

 in its general features resembles some of the forms already recorded, 

 especially that of Dr. Zeiss. It differs from the latter, however, in 

 the mode in which the quartz plate is inserted above the objective, 

 and in the two millimetre graduations of the stage intersecting in the 

 centre at right angles. The polarizer is on a movable arm so that it 

 can be rapidly turned away. Each 90° of rotation of the analyser is 

 marked by a spring catch. 



