PROFILOMETRY OF HAIR 41 I !• 0 15 30 45 60 75 90 105 120 135 150 [ 0 1 0 45 6 50 direction of scan in pm direction of sca•ln •m 15304• 6• 7• 961651•O li5 lgO [ •O' 1'53' 400'560 .7'• 901_O51•O 13.51•O direction of scan in •m [ direction of scan in •m Figure 17. Examples of cross-sectional contours of hair fibers without (a) and with (b) free rotation of the axes. o o o o o o o o o o o o direction of scan in mm Figure 18a. Surface profile of a hair fiber (scan length 40 mm, axe-shaped stylus) before twisting.

42 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS o o o o o o o o o o o o direction of scan in mm Figure 18b. Surface profile of a hair fiber (scan length 40 mm, axe-shaped stylus) after twisting around the fiber axis (-0.5 rotation/cm fiber length). REFERENCES (1) T. Teasdale, G. Blankenburg, and H. Philippen, Querschnittsparameter von Humanhaaren, •rztl. Kasmet. II, 161-170 (1981). (2) C. E. Orfanos, W. Sterry, and T. Leventer, "Haar und haarkosmetische Ma[3nahmen," in Haar und Haarkrankheiten, C. E. Orfanos, Ed. (G. Fischer Verlag, Stuttgart, 1979). (3) H. Dagnall, Exploring Surface Texture, (Rank Taylor Hobsen, Leicester, England, 1980), pp. 50-60. (4) H. Wolff, Die Bedeutung des cut-off bei der Oberfliichen-priifung mit Tastschnittgeriiten, Werkstatt und Betrieb, 92, 817-820 (1959). (5) U. Miiller, Vermessung und Analyse van Haaren mit Hilfe der digitalen Signalverarbeitung, Universitiit der Bundeswehr, Hamburg, January 1986. (6) B. Schubert, Entwicklung einer Methade zur Dickenmessung van Humanhaaren, Diplomarbeit, Fachhoch- schule Hamburg, FB Bioingenieurwesen, Hamburg-Bergedorf, June 1986. (7) J. A. Swift, "The Hair Surface," in Hair Research, C. E. Orfanos, W. Montagna, and G. Stiittgen, Eds. (Springer Verlag, Berlin, 1981). (8) Y. K. Kamath, and H.-D. Weigmann, Measurement of combing forces, J. Sac. Cosmet. Chem. 37 111-124 (1986). (9) C. R. Robbins, Chemical and Physical Behavior of Human Hair (Van Nostrand Reinhold Company, New York).