Abstract
A new apparatus is described which measures the momentary co-efficient of friction and the interfacial electrical resistance of a sample sliding in a rotating hoop under the combined action of friction and gravity. The apparatus is housed under a bell-jar and thus can be used in various ambient atmospheres or vacuum. Preliminary measurements made on a brass sample and on a Ag-graphite sample (75 wt.% Ag), sliding on α-brass, are discussed in terms of the surface film resistivity and number of contact spots as a function of normal force.
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