a. [f. prec. + -AL.] Of, pertaining or relating to, or caused by or resulting from torsion.
1861. Fairbairn, Iron, 195. Experiments … on the torsional strength of iron cast in various forms.
1873. Maxwell, Electr. & Magn., § 215. The torsional elasticity of a glass fibre or metal wire.
1879. Thomson & Tait, Nat. Phil., I. I. § 435. The torsional rigidity of iron, copper, and brass wires is diminished about 1/2 per cent. with 10° elevation of temperature.
1882. Rep. to Ho. Repr. Prec. Met. U.S., 583. There is … considerable torsional strain upon the shaft, depending on its length.
1909. Athenæum, 6 March, 292/1. Interesting experiments are described on the energy dissipated through torsional hysteresis.
Hence Torsionally adv., in respect of torsion.
1890. Nature, 2 Jan., 198. The internal friction of a torsionally oscillating iron wire.
