The elevation measuring instrument developed by the authors is based on the principle of the twin-wire resistance probe. The output of the twin-wire resistance probe is proportional to its depth of immersion in water. This technical note discusses the design of the instrument and presents the comparison between the experimental and actual elevation difference.
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References
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Evett, Jack B.1979. Surveying, John Wiley & Sons.
2.
Liu, C.Y. and Ng, K.L.1984. Design and construction of precision twin resistance probe manometer, Ref No RP29/84, Nanyang Technological Institute .
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Liu, C.Y. and Poo, A.N.1981. 'Thin-wire resistance probe manometer', Rev Sci Instr , American Institute of Physics, 52 (2), 231-241.
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Liu, C.Y., Ng, K.L. and Poo, A.N.1985. 'Performance study of the twin-wire resistance probe manometer' , CANCAM-85 London, Canada.
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Scott, G.A.1981. Construction Survey (6 ed) Longman.
