closed to prevent any accidental displacement of the circle.
The micrometer knob (25) must now be turned until the graduation lines coincide
exactly when the micrometer scale is shown to its end, no further turning is allowed
in order to avoid damage to the scale.
Note: The last turn of the knob should be clockwise. In the left or central part of the
top window are seen the whole degree numbers. Below this is the number for tens
of minutes. In the left part of the scale seen the numbers for minutes. In the left part
of the scale seen the numbers for minutes and right, tens of seconds. The value of
one scale interval is 1″.
Reading in the top window 150°00′ Reading in the top window 74°40′
Reading in the left window 150°01′54″
Reading in the left window 74°47′16″
4.2 Vertical circle reading
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