JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Figure 11. Two stills, photographed from the TV screen during a dynamic experiment, showing the formation of loops and lifting of cuticle during combing. • -•. • •.. .. "-.' .•--: •.• r• % • •, . . .. . - • .• Figure 12. A s•uence of stills, photog•phed from the TV scr•n, showing the final br•kdown of a tighten• loop.

JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Lower jaw of extending stage Microswitch cut-out Top plate with strain Micromotor gauges attached / / ....... ., ..".' - ,.' ,TZ•' Strain gauge con nections Figure 13. The specimen stage used for extending hair loops. Figure 15. Load/extension curve obtained during a 'static-loop' breaking experiment. The sequence of still micrographs was photographed from the TV screen during the experiment. Irregularities in the curve just before fracture relate to the breakdown of structural elements in the hair fibre.

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