30 JOURNAL OF COSMETIC SCIENCE Afi n/a 1.700 0.290 0.095 Figure App. l(a). h=O �2-------��---���---:--� u .c ::::I u 1 0 • • • • • ♦ • • • 2 Height, cm 4 Figure App. I(b).

CHANGES DURING EVAPORATION OF EMULSION V = 1.275TI0.0.1952/3 = 0.051 The volume of the truncated pyramid with the larger base at h: V = [ 1r(0.1529 h + 0.1506)2(h + 0.985 )/3] - 0.051 = 0.245 h3 + 0.0726 h2 - 0.0715 h - 0.0746 The volume of the cylinder for heights in excess of 1.99 cm: V = 0.6132 + 1r0.4552(h = 1.99) 31 The volumes are added to obtain a curve of the volume versus the height above the bottom of the test tube (Figure App. I(b)). APPENDIX II CORRECT LOCATION OF DIVIDING PLANE IN A TRUNCATED CIRCULAR PYRAMID (FIGURE APP. II(a)) +R d -R Figure App. II(a).

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