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1.8 Clinometer BS-704 (Option)
The clinometer detects ship’s inclination caused by ship’s rolling and pitching
and its output is used to stabilize the sonar beam against rolling and pitching.
The clinometer is, in principle, a pendulum. It measures the inclination of the ship
by sensing the direction of gravity acted on it and therefore when installed on a
ship, it should be placed on or near the rotation axes of the ship’s rolling and
pitching. If it is placed away, upward from the axes, the measured value be-
comes larger than the correct value. On the contrary, if it is placed below the
axes, the measured value becomes smaller. The same can be said when it is
placed far to the left or right from the axes.
The rotation axes of pitching and rolling are theoretically considered to be lo-
cated on the level of the ship’s draft and in the center of ship. In other words, it
can be said as follows.
1) Vertical position of the pitching and rolling axes is on the draft level of the
ship.
2) Horizontal position of the rolling axis is in the center of ship’s port-starboard
line.
3) Horizontal position of the pitching axis is in the center of ship’s fore-aft line.
From 1), 2) and 3) above, the crossing point of the two axes is indicated by the
black dots in Figure 1-21. The clinometer should be mounted as close as pos-
sible to this point.
Pitching Axis
Rolling Axis
Figure 1-21 Installation Position of Clinometer