The Borehole function models water flow through a borehole ... Blind kriging: A new method for developing metamodels. Journal of mechanical design, 130, 031102. Moon, H. (2010). Design and Analysis of ...

Key to the design was that the device could readily be destroyed and flushed out of a borehole with an air blast in the event it got stuck. Eventually, mining outfit Metrologi got involved ...