ground roller

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Noun1.ground roller - Madagascan roller with terrestrial and crepuscular habits that feeds on e.g. insects and worms
roller - Old World bird that tumbles or rolls in flight; related to kingfishers
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It measures thickness of monolayer film between a non-contact gauge and a ground roller. The capacitive gauge measures film thickness and the eddy-current measures the distance from the gauge to the roller to compensate for changes in sensor distance from the film.
NPR pick-up paper feeding rollers were made by compression molding using molds with a special embossed surface which simulates that of a ground roller. Cure conditions of the roller were at 160 [degrees] C for 10 minutes.