Abstract: This paper gives a historical rcview of the early research on anelas-ticity during the author,s stay at Chicago (1945-1949). The rcsearch topicssuggested initially by Professor C. Zener, the founder of the concept of anelas-ticity, include the studies of the mechanical properties of grain boundaries andthe slip bands in metals by anelastic measurements. The torsion pendulum andthe moving coil twisting arrangement wcrc dcvelopcd for this purpose so that in-ternal friction, dynamics modulus defcct, creep unde...