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Agronomy Journal Abstract -

A Differential Fluid Manometer for Hydraulic Lysimeters1


This article in AJ

  1. Vol. 76 No. 1, p. 160-163
    Received: June 28, 1983

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  1. N. B. McLaughlin and
  2. H. R. Davidson2



A manometer that uses two fluids of different densities is described. The manometer is similar to the conventional manometer except that it has an enlarged reservoir at the top of the tube. The lower density fluid floats on the higher density fluid so that the interface between the two fluids is in the manometer tube and the free surface of the lower density fluid is in the reservoir. The manometer is read at the interface. The differential manometer has a greater sensitivity than the conventional manometer and is useful for measuring mass changes in a hydraulic lysimeter.

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