BIBLIOGRAPHY avi 
given on one end of the object micrometer. By focusing the object 
micrometer with a definite combination of an objective and micrometer 
eyepicce at a definitely fixed tube length and comparing the two microm- 
eter scales, 1 is easy to find the actual length in the plane of the object 
which corresponds to one scale division of the eyepiece micrometer. 
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