  We have measured the dependence of the hysteretic voltage-induced torsional
strain (VITS) in crystals of orthorhombic tantalum trisulfide on temperature
and applied torque. In particular, applying square-wave voltages above the
charge-density-wave (CDW) threshold voltage, so as to abruptly switch the
strain across its hysteresis loop, we have found that the time constant for the
VITS to switch (at different temperatures and voltages) varied as the CDW
current. Application of torque to the crystal could also change the VITS time
constant, magnitude, and sign, suggesting that the VITS is a consequence of
residual torsional strain in the sample which twist the CDW. Application of
voltage changes the pitch of these CDW twists, which then act back on the
lattice. However, it remains difficult to understand the sluggishness of the
response.
