Lisbon, Academia Real das Sciencias, 1878.
8vo. 11 pp. With 4 diagrams in text. Original printed wrappers.
The work studies the density of solids and liquids. Virgilio Machado was Portugal's most important pioneer in electrolysis, and founded the Instituto Médico in 1903. In 1881 he was chosen by the government to attend the Exposition International de l'Electricité in Paris. (Offprint from "Jornal de Sciencias Mathematicas, Physicas e Naturaes," No. XXIV). Presentation copy from the author to King Fernando of Portugal. Innocêncio XIX, 341 & XX, 20.