TM 5-6675-306-14
3) to bring into view a clear image of the object being
WARNING
sighted.
h. The horizontal and vertical circle reading scales
Severe eye damage can result from
are both observed through the microscope eyepiece (fig.
performing observations against direct
sunlight without utilizing the telescope
horizontal position, the horizontal circle image appears
black sunglass.
in the upper window (fig. 214). When the inverter knob
g. Focus the telescope as follows: (1) Direct the
is turned with the line in the vertical position, the vertical
telescope toward a uniformly light background. Adjust
circle image appears in the upper window.
the telescope eyepiece (fig. 1-1) until the crosslines are
Simultaneously with either of the circle images, the
sharp and black.
NOTE
image of the micrometer scale is always visible in the
Observe the setting on the eyepiece
lower window (fig. 2-14).
constant for the same observer but
will vary for other observers.
(2) Adjust the telescope focusing tube (fig. 1-
2-34
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