Explain the procedure of measurement of deflection angle.

Explain the procedure of measurement of deflection angle.
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Answer :

Procedure: 1. The theodolite is set up at B and centered and leveled properly . Vernier A is set at 0 0.and B at 1800 .The lower one is loosened. By turning the telescope the ranging rod at A is perfectly bisected using lower plate clamp and tangent screw. 2. The telescope is transited. 3. The upper clamp is loosened. By turning the telescope clockwise ,the ranging rod at C is properly bisected using upper plate clamp and tangent screw.The readings on both vernier are taken. 4. The lower clamp is loosened and by turning the telescope clockwise the ranging rod at A is again bisected using the lower clamp and tangent screw. 5. The telescope is transitied .Upper clamp is loosened and by turning the telescope clockwise, the ranging rod at C is bisected using upper plate clamp and tangent screw. The readings on verniers are taken. 6. Thus the deflection angle is doubled. The average angle of two faces is calulated. One half of this angle will be the deflection angle.

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