III. On the torsional strain which remains in a glass fibre after release from twisting stress

Abstract

It has long been known that if a wire of metal or fibre of glass be for a time twisted, and be then released, it will not at once return to its initial position, but will exhibit a gradually decreasing torsion in the direction of the impressed twist. The subject has undergone a good deal of investigation, especially in Germany. The best method of approximating to an expression of the facts has been given by Boltzmann (“Akad. der Wissensch. Wien,” 1874).