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The aiming beam needs
to be pivoted about its central point so that it can swing up and down.
The protractor should be centred on the pivot, from which the plumb line
should be suspended. Using a compass, mark out a line on the ground that
runs north to south. Make sure that your quadrant is set up so that its
aming beam is parallel to this north-south line.
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A quadrant for measuring latitude
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