| 摘要 |
The thickness of an electroconductive coating on an electrically non-conductive web is measured in the transverse direction by an arrangement including a first roller connected to an AC tension and a second roller having a plurality of roller sections located in close side by side insulated relation transversely across the web, electric change-over contacts movable between an inoperative position connecting under the control of an appropriate controller, the roller sections in succession to the input of a high gain amplifier with resistive feedback, and a measuring device for measuring the output signal of the amplifier.
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