Figs. 40, 41, 42, 43, 44, and 45. Setting up a research microscope on an Ortho- 

 Illuminator. Fig. 40. The microscope is placed over the illuminator and moved until 

 the X10 objective is filled with light. Fig. 41. The substage iris is closed and the 

 XlO objective focused on the iris. The substage centering screws are then used to 

 center this iris. Fig. 42. The substage iris is opened, the field iris closed, and the 

 XlO objective focused on the field iris. The field iris centering screws are then used 

 to center this iris. Fig. 43. A pinhole eyepiece is substituted for one of the regular 

 eyepieces. Fig. 44. The lamp centering screws are then used to bring the image of 

 the filament which is now seen through the pinhole into the center of the field of 

 view. Fig. 45. The intensity selector is moved until die desired intensity is obtained. 



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