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SUMMARY OF CURRENT RESEARCHES RELATING TO 
on which the object is fastened. In the majority of cases, however, it 
is sufficient to fix the object with wax, and adjust by hand. The adjust- 
ments of the comparator can be quickly made. First, the scale M must 
be moved by means of the two adjusting screws on its free end until no 
deviation with respect to the Microscope is noticed during a displacement 
