Abstract
THE friction apparatus devised by Bowden and Leben1 to examine the friction of metals has been used to study the frictional properties of wool fibres. Some accessories were made to adapt the apparatus to the application of loads of 0·05–1 gm. and the measurement of small frictional forces, but in essentials it remains the same as described by the above authors. The modifications enabled a single fibre mounted in a bow to be carried forward with a speed of 0·01 cm. sec.-1 while pressed against a cylindrical piece of ram's horn with the required load. The horn was mounted on a strip of clock spring, the deflexion of which, recorded photographically by a moving-film camera, was a measure of the frictional force.
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