DESCRIPTION OF FIG. 1 



A. Base to support instrument. 



B. Pillar to support instrument. 



C. Joint for inclining instrument. 



D. Stage for reception of object to be examined. 



E. Hole for attaching mechanical stage. 



F. Mirror for illuminating transparent objects. 



G. Substage for carrying illuminating apparatus. 

 H. Substage focussing adjustment. 



J. Substage condenser for regulating the illumination. 



K. Iris diaphragm for varying the light. 



L. Limb for holding the body and stage. 



M. Body for carrying the observing lenses. 



N. Drawtube for lengthening body. 



Nl. Drawtube stop to prevent reflections from tube entering eyepiece. 



O. Eyepiece, combination of lenses nearest observer's eye. 



P. Fine adjustment for delicate focussing of body. 



Q. Coarse adjustment for rapid focussing of body. 



R. Object glass, combination of lenses nearest the object. 



S. Nosepiece with universal screw for carrying object glsisses. 



T. Eyepoint position where all emergent light passes through a small 

 area and where observer's eye should be placed. 



U. Position where the primary image formed by the object glass is 

 produced. 



v. Position where final virtual image formed by eyepiece is produced. 



