COMPASS TRAVERSING – MEASURING BEARINGS & ARRIVING
INCLUDED ANGLES
Aim: Measurement of bearings of sides of traverse with prismatic compass and computation of
correct included angle.
Instruments Required: Prismatic compass, ranging rod, chain, tape, peg Tripod stand
Procedure:
1) Four ranging rods are fixed at different points i.e. A, B, C, D etc. such that it should be
mutually visible and may be measured easily.
2) Measure the distance between them. 1) At point A the prismatic compass is set on the tripod
Stand, centering and leveling is then properly done. 2) The ranging rod at B is ranged through
sighting slits and objective vane attached with horse hair and reading on prismatic compass is
noted down.
3) It is fore bearing of line AB. Then the prismatic compass is fixed at B and ranging rod at C
and A are sighted. And reading is taken as forbearing of BC and back bearing of AB.
4) Repeat the same procedure at the stations C, D etc.
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