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give information about the dependence of the tunneling on any particular parameter. We have designed an experiment which can determine the dependence of the tunneling on the single parameter w, the junction gap width, and thus make detailed comparisons with the tunneling theory.The junction width w was modulated by applying an ac mechanical stress at 25 Hz to the C-PVC. The sample was mounted in a stainless steel yoke with a piezoelectric transducer, and the yoke was tightened until the stress applied to the sample and transducer produced a static strain of about 0.5%, measured with a strain gauge glued to the sample, a cube of about 7 mm on a side. A small dc bias current was passed through the sample, and the dc voltage developed across potential leads on the sample face was used to measure the resistance; the ac voltage developed when the transducer was driven at 25 Hz was used to measure the piezoresistance. Similarly, the dc voltage in the strain gauge measured gauge resistance and therefore the 24

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