Tests for mechanical properties of yarns, including breaking strength and elongation by four different methods, size, and twist are discussed. Special emphasis is given to the interpretation of the results obtained. The factors of speed, capacity, and rate of loading of the testing machine, yarn structure, and calibration of machines are briefly considered and the field of application and limitation of the tests are indicated. Brief references are made to miscellancous or special tests for diameter, lustre, coefficient of friction, repeated loading, resilience, and torque relaxation.
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