| http://www.w3.org/ns/prov#value | - The device shown in FIG. 7 makes use of strain perturbation of the photoconductivity of a material, and comprises a bar 36 of a material such as a slightly p-type silicon, a light pattern generator 38 for projecting on the bar 36 a light image which varies only in the dimension along the length of the bar 36, means for vibrating the bar 36, means for causing a constant current flow through the bar
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