ERRORS OCCURRING IN THE PRESENT METHODS OF PROPORTIONING RAW MATERIALS IN POTTERIES AND A METHOD WHICH SEEMS TO BE MOST RELIABLE. 2

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In this second article of the series, significance of wet processes of proportioning ceramic raw materials are explained and errors which may occur in the processes are discussed.Required weight of raw material, G, can be obtained by measuring sp. gr. of slip, S, and its volume V as the following formula shows:G=(S-b)/(a-b)⋅aVWhere a and b are sp. gr. of raw material and water respectively.The ratio of the maximum probable error in the required weight of raw material, dG, to the weight G can be expressed as follows:dG/G=dV/V+|-bda/(a-b)a|+|-(a-S)db/(a-b)(S-b)|+dS/S-bIn the equation, errors in the measurement of volume V and sp. gr. of water b are almost negligible; effect of error in the measurement of sp. gr. of raw material, a, may be large provided that the value of a is compartively small; effect of error in the measurement of sp. gr. of slip is most fearful especially when its value is small.
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