Extension by Israelachvili and Tabor

After this stunning piece of work, Winterton joined the Nuclear Laboratories of the Electricity Generating Board at Berkeley, eventually becoming a lecturer at Birmingham University, while Tabor continued with a new PhD student, Jacob Israelachvili, who continued to develop the mica surface force apparatus as it was soon to become known. His immediate contribution was to push the jump distance from 5 nm down to 1.5 nm and then to measure the effect of stearic acid monolayers on the mica surfaces.  

Figune 4.9. Comparison of theory and results for attractive force between mica crossed cylinders in air, showing on the left-hand side how the force rises beyond the range of measurement (i.e, 100 pN) at close contact. 

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