Question

pr.1 The Observations were made from station P to signal at station Q. The distance
between Pand Qis 12.5 km and diameter of signal at station Q was 20 cm. The sun rays make an angle
of 50° with line PQ. Calculate the phase correction if observations were made:on the bright portion,on the bright line.. ,A base line was measured with a steel tape of designated length 30 m at 20°C ata pull of 100 N. The measured length of base line was 1543 m. The field temperature was 31.5°C and
the pull applied was 130 N. Find the correct length of base line. The cross-sectional area of tape is
2 mm2, coefficient of thermal expansion of steel is 2.5 x 10-6°C-1 and E = 2x 105 N/mm?.

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Answer 1