1 – Orientation: Brunton Eclipse 8099
The Eclipse 8099 compass is a sighting instrument which uses the Earth’s magnetic field to display
a bearing (direction) in degrees. The Eclipse 8099 also contains three clinometer scales to meas-
ure angles from horizontal (0°).
The orientation section provides a description of important Eclipse 8099 parts. A detailed
description of Eclipse 8099 operation is provided throughout the instruction manual.
1.1 Sight Cover (Fig 1)
The sight cover opens to three pre-measured angles – 45°, 90° and 120°. Use 45° for forward
mirror sighting and 120° for reverse mirror sighting.
1.2 Vial (Fig 1)
The vial is a clear fluid filled extrusion containing a needle disk with a red circled "N" (described
in 1.3), blue orienting circle (described in 1.9) and a green clinometer arrow (described in 1.10).
The fluid inside the vial stabilizes the needle disk and clinometer arrow.
1.3 Needle Disk –
RED circled "N" (Fig 1)
The needle disk contains a permanently magnetized ferrous material which orients the red
circled "N" to magnetic north. Also printed on the needle disk are "E", "S" and "W", for quick
directional reference.
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