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To gain a more fundamental understanding of the frictional properties of skin, various parameters (hydration, oils, surfactants, etc) affecting skin friction were evaluated using a rotational friction technique. The rotational device utilized a motor-driven wheel. The wheel and drive shaft were connected to the motor through a flexible rubber coupling in such a way that friction encountered by the wheel caused a lateral displacement of the drive shaft which was monitored by a photocell and recorded on a strip-chart recorder.

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