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1. Estimates of curvatures of the shell of a well‐formed egg can be obtained by the method described, which is based on six measurements of the shell.
2. Estimates of the radii of longitudinal curvature at the equators of 24 eggs selected for their extreme shapes or sizes ranged from 284 to 42–7 mm; the standard deviation of the difference between such an estimate and one obtained for the same egg by the 3‐point method (using a slot and dial micrometer) was 1.2 mm.
3. Other tests, which are described, indicate that the method is reliable for estimating the principal curvatures at any point on the shell and not merely at the equator.