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“Adding cobalt, say, to clear glass changes the glass’s coefficient of expansion.”

This, with a knowledge of the temperature of the screw or scale and its coefficient of expansion, would enable the change of screw-value to be determined at any instant.

In uniaxial crystals there are two principal coefficients of expansion; the one measured in the direction of the principal axis may be either greater or less than that measured in directions perpendicular to this axis.

If the coefficient of expansion of these three layers differs, in other121 words, if the glaze does not fit, the result is crazing, that bugbear of the potter.

The expansion of a gas 1⁄273 of its volume for every degree Centigrade, added to its temperature, is equal to the decimal .00366, the coefficient of expansion for Centigrade units.