Screw micrometers combined with an electrical contact indicating device have been adapted to measuring the dimensions of soft rubber parts.Three types of gages have been built.Two of these are vertical gages for thickness measure- ments and the other is a horizontal gage for dimensions, such as the width of test specimens and the diameter of cylindrical or spherical parts.Measurements made with the micrometer gages are compared with (1) the thickness or diameter computed from the volume and (2) those made with the usual type of dial gages.The micrometer gage measurements agree very closely with the computed values due to the precision of the micrometer screw and the fact that there is little compression of the rubber at points of contact. CONTENTSPage I .Introduction 575 II.Indentation of rubber by spherical contacts 575 III.Description of gages 576 IV.Use of gages and precision of measurements 580 V. Comparisons with other methods of measurement 581 VI.
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William L. Holt (1933) studied this question.