10—THE EFFECT OF MOISTURE UPON THE ACCURACY OF CAPACITY-TYPE REGULARITY TESTERS

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Abstract
Measurements of the effect of relative humidity upon the deflection of two capacity-type regularity testers have shown that for cotton the effect is so large that, unless suitable precautions are taken, serious errors may arise in the nrieasurement of coefficients of variation. Observations of the rate of diffusion of moisture into yarn and roving bobbins and into cans of sliver, however, have enabled a fairly simple procedure to be devised, which should ensure that the error in the coefficient of variation is less than 5% of the coefficient. For Fibro, the effect of moisture is less than for cotton; but, since Fibro materials are often more regular, similar precautions are advisable. No measurements have been made on other fibres.