Face-Left/Face-Right Measurement - Nikon DTM-350 Instruction Manual

2-8 Face-left/Face-right Measurement

Face-left Measurement: Measurements made with the vertical circle positioned to
Face-right Measurement: Measurements made with the vertical circle positioned to
Be careful not to catch your finger in the opening between the
instrument's standard and the telescope when rotating the telescope.
Mechanical constant error (except in some special cases such as vertical
axis error) can be effectively cancelled out by averaging the
measurement values obtained in face-left and face-right measurements.
Therefore, both measurement methods should be used whenever
possible.
Face-left measurement
the left of the telescope eyepiece
the right of the telescope eyepiece
Face-right measurement
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