†3

The areas of annealed wires of Ag, Au, Al, and Cu were reduced by cold working (drawing through dies at room temperature). The fractional increase in resistivities of Ag and Cu wires at room and liquid-air temperatures are plotted as a function of areal reduction to see whether change in resistivity due to cold working is independent of temperature (Matthiessen’s rule applies). For Cu the change in resistivity is independent of temperature, but for silver deviations from Matthiessen’s rule were found.