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Trough Compass
It consists of an 80 to 150 mm long and 30 mm wide box carrying a freely suspended needle at its centre as shown in figure. Graduations are marked at the ends of the needle on the box to show zero to five degrees on either side of the centre. The box is provided having glass top to prevent oscillation of the needle by wind. When needle is centred (reading 0-0), the line of needle is parallel to the edge of the box. Therefore marking on the edges in this state shows magnetic north-south direction.
Trough compass
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