With the low power objectives, which are used on 

 coarse and large objects, it will be found after properly 

 focusing, that a portion of the object will show itself in 

 the field and by moving the slide it can easily be 

 brought, to the center. In this connection it must be 

 remembered that the image in the eyepiece is in a 

 reversed position from that of the object and that a 

 movement of the object to the left gives an apparent 

 movement to the right in the field. This will create 

 confusion at the outset, but after a little practice the 

 movement becomes involuntary. In the case of a small 

 object which is not found after the objective is known 

 to be in focus, as may be told if the mounting medium 

 or small particles of dust on the cover glass are visible, 

 move the slide about on the stage by grasping one end 

 with the thumb and forefinger, when the object can 

 usually be recognized by the shadowy outlines as it 

 flits across the field. The difficulty of finding an 

 object or a particular spot in it becomes more difficult 

 with the increase in power and even in experienced 

 hands becomes quite vexatious. Recourse may be had 

 to two methods : 



By using a low power eyepiece, 



By using a low power objective as a finder. 



A large field is thus obtained in which the object 

 may be more easily found, and after moving to the 

 center of the field the objective is removed and the 

 high power attached ; or in case revolving nose-piece 



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