  We compare the results for the related to the shear strain \epsilon_4
physical characteristics of Rochelle salt obtained within the recently
developed modified two-sublattice Mitsui model that takes into account the
strain \epsilon_4 and the diagonal components of the strain tensor \epsilon_1,
\epsilon_2, \epsilon_3 with the results of the previous modification of the
Mitsui model with the strain \epsilon_4 only. Within the framework of the model
with the diagonal (thermal expansion) strains, we also reexamine the effects of
the longitudinal electric field E_1 on the dielectric properties of Rochelle
salt.
