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Surveyor compass versus Prismatic Compass - Compass used in Surveying

COMPASS USED IN SURVEYING

Parameter	Surveyor’s Compass	Prismatic Compass
Magnetic Needle	Edge bar needle is used and it act as index	Broad needle is used and it is hidden below the aluminium ring and does not act as index.
Graduation	Graduated ring is attached to the box and ring rotates with box. Graduations vary from 00 to 900 in the four quadrants. Zero points are marked with N and S.	Graduated ring attached to the needle and remains stationary. Graduations vary from 00 to 3600 clockwise with zero at south end.
Sighting Vanes	Readings are taken by directly looking through the glass and reading the north end of needle.	Readings are taken through the vertical side of the prism provided at the eye vane.
Reading	Sighting and reading are done separately and that too from different positions. After sighting the object, the observer move around and takes the reading at North end of needle.	Sighting and reading are done simultaneously.
Support-Requirement	Tripod is compulsory.	Tripod may or may not be used.