Electrical measurement of silk thread diameter

Continuous measurement of the diameter of silk thread may be made and recorded by the apparatus herein described, which depends for its operation on changes in capacitance as variations in thread diameter move the jaws of a caliper. From the record the quality of the fabric may be predicted closely, and by the addition of integrating devices a numerical reading for quality rating may be obtained at the end of a run. The applications of the measurement in the control of knitting, limit testing, and quality rating are discussed, and the results of comparisons with present methods of rating the quality of raw silk yarn are given.