A new, simplified apparatus has been developed for fatigue-testing fibres using the technique of biaxial rotation over a pin. This involves the tension-compression of fibres which are rotated whilst bent over a pin. The angle through which the fibre is bent during a fatigue test can be altered, and the effect of this on fatigue life and fracture morphology has been investigated.To remedy this situation a prototype singlc-station tester, operating on a similar principle but with the jaw shafts aligned parallel, has been constructed (figure 2). This greatly facilitates the gearing of the apparatus and allows a number

concentration (Ditchburn, Tunstead and Yates 1943) was employed. NO trace of molecular absorption was detected. If only atomic absorption is present,B is the total absorption, U is the atomic absorption cross

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