Surveying Compass are of following two types:
1) Prismatic Compass
2) Surveyor's Compass
1) Prismatic Compass
It is most suitable type of surveying compass which consists of a circular box about 100mm in diameter. Prismatic compass can be used as a hand instrument or on a tripod. Prismatic compass can be accurately centered over the ground station mark.
2) Surveyor's Compass
Surveyor's compass is similar to the construction to the prismatic compass with a few modifications stated below:
a) The graduated ring is directly attached to the circular box and not wiht the megnetic needle.
b) The edge bar magnetic needle floats freely over the pivot.
c) The eye vane consists of a simple metal vane with a fine sight hole.
d) Readings are taken against the north end of the needle.
e) The ring is graduated in quadrilateral system having o degree at North and south ends, 90 degree at East and West Ends.
1) Prismatic Compass
2) Surveyor's Compass
1) Prismatic Compass
It is most suitable type of surveying compass which consists of a circular box about 100mm in diameter. Prismatic compass can be used as a hand instrument or on a tripod. Prismatic compass can be accurately centered over the ground station mark.
2) Surveyor's Compass
Surveyor's compass is similar to the construction to the prismatic compass with a few modifications stated below:
a) The graduated ring is directly attached to the circular box and not wiht the megnetic needle.
b) The edge bar magnetic needle floats freely over the pivot.
c) The eye vane consists of a simple metal vane with a fine sight hole.
d) Readings are taken against the north end of the needle.
e) The ring is graduated in quadrilateral system having o degree at North and south ends, 90 degree at East and West Ends.
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