Research project deals, intent of the setting out of right angles and accurate centring over the survey station will be done over this method of apparatus and carrying the combustion of prism with reduction of cost. The cross staff is worked the triangulation principle. The ternate cross staff is used for viewing the object by stacking of prism below and above the plain object vane. The objects are clearly viewed and coincide with the line obtained the straight cross hair despite that, laser will be provided for day-to-night time periods and illuminated coat will be provided over the staff. The target objects are aligned to coincide with the cross hair when the objects are setting out. The cross staffs ate properly setting over the survey station by adjusting screws and accurately levelled by sprit level. The ternate cross staff is used to setting out the offsets for various survey station like highways and sewer lines.
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