Abstract
A small air-flow fineness tester for wool, which uses the sonic system and gives a direct reading of the fibre diameter, is now available commercially. It Is intended specifically for measurements of fibre diameter in such applications as ram selection and flock-culling. The instrument is accordingly calibrated for full-length hand-carded wool and uses a 2-g test specimen. An account is given of the instrument and trials conducted with it. An accuracy of ±0.5 μm is obtained if corrections for altitude and ambient conditions are made. An interesting feature is that it has been possible to produce commercial instruments with identical calibration characteristics. This has important implications for the future of the air-flow method.
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