Abstract
IN the light of Dr. Schnurmann's above remarks, it appears that he is still unconvinced by our original interpretation of frictional data1 on the Bowden-Leben apparatus, when a small steel spherical surface was slid over copper covered with thin films of soft metals (lead, cadmium and tin), and also by later additional experimental data2. It was originally suggested that the reduction in the coefficient of friction, µ, from 0.5 to 0.7 for steel on the bulk metals lead and copper, say, to 0.03–0.08 for films of lead, 10-5-10-6 cm. in depth, was due to the combination of a thin soft film on a hard substrate maintaining a small area of contact across which “the adhesion and deformation resistance” was very low. Dr. Schnurmann considers the effect is solely due to a reduction in the “ploughing action”.
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