Description

Surveyor’s Compass :

The graduated ring is directly attached to the box instead of the needle in the surveyor’s compass. The needle is allowed to float freely over the pivot, but it does not orient itself to the magnetic meridian as in the case of a prismatic compass.

Object vane and eye vane are similar to that of the prismatic compass, however, no prism is provided. The instrument is to be fixed on a tripod.

The readings through this compass are taken against the north end of the needle by looking through the top glass vertically. When the line of sight coincides magnetic meridian, north and south ends are at 0°. While the east and west end correspond to 90°.

Temporary or permanent adjustments are to be carried out for the compass as required. Centering and leveling are temporary adjustments. The temporary adjustments are to be made every time the instrument is set.