Perfect leveling by foot screws

As the longitudinal bubble is on the top of be telescope, the latter is placed parallel to any pair of foot screws (i.e. first position) and the bubble is brought to the center by turning the foot screws equally either both inwards or both outwards. The telescope is then turned through 90o (i.e. second position) and turning this foot screw clockwise or anticlockwise .The telescope is again brought to its original position (the first position) ad be bubble is again brought to the center. The process is repeated several times until the bubble remains in the central position in the first as well as the second position. Then the telescope is turned through 180. Technical Data used in the field explained in civil surveyor course in rawalpindi. If the bubble still remains in the cased position, the temporary adjustment is perfect and so is the permanent adjustment But if the bubble is deflected from its central position, the permanent adjustment is not perfect and needs to be modified.

Focusing the eye-piece; A piece of white paper is held in front of the object glass and the eye piece is moved in or out by turning it clockwise or anticlockwise until the cross-hairs can be seen clearly. Focusing the Object glass; the telescope is directed towards the leveling staff. Looking the eye-piece, the focusing screw is turned clockwise or anticlockwise until the graduation of the staff is distinctly visible and the parallax is eliminated. Some more details of civil surveyor course in rawalpindi are as under. To eliminated the parallax, the eye is moved up and down to verify whether the graduation of the staff remains fixed relative to the cross-hairs

Taking the staff readings; finally, the leveling of the instrument is verified by turning the telescope in any direction. When the bubbles (the longitudinal bubble and cross bubbles) remain in the central position for any direction of the telescope, the staff readings are taken. TSK Training for Skills and Knowledge is the best institute in Rawalpindi Islamabad for Pakistani Students who wants to join civil surveyor course in islamabad.

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