Physique

1879 — Lo scritto del Villari si trova alle pp. 49-74 + IV tavole incise su cartoncino, nelle Memorie degli Atti della R. Accademia dei Lincei, anno 1878-79, volume IV. Volume (30 cm) di 356 pagine, contenente ovviamente altri studi e memorie. Brossura editoriale; usure, manca la copertina posteriore e l'indice. “Villari's name is linked to studies on ferromagnetism and he is responsible for the discovery of the change of magnetic susceptibility of a material subjected to mechanical stress, a phenomenon known as the Villari effect. The Villari reversal is the change of sign of the magnetostriction of iron from positive to negative when the material is exposed to magnetic fields of approximately 40000 A/m (500 oersteds)”. (Smithsonian Libraries).