Abstract
The justification, design parameters and status of a new 8.6 m prototype fluid column designed to operate up to 5.8 MPa in five 1.2 MPa steps are described, with an analysis of the expected and potential uncertainties. The development of taller, higher pressure columns is discussed. A proposed new technique is described for the precise measurement of vertical height that does not require line-of-sight measurement. In this technique, the length scale is set up alongside the pressure scale using a low-pressure mercury and water column acting as a multiplier, and then transferred by differences to the pressure column. The accurate determinations of the compressibility and density of mercury to high pressures are shown to be the critical fundamental parameters required to exploit fully the potential of very tall, high-pressure fluid columns.
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