GIA4715583: Scientific experiment: the calculation of the speed of sound, by Humboldt, Louis-Joseph Gay-Lussac (Louis Joseph Gay Lussac), Bouvard, Prony and Mathieu, which determine the time elapses between the perception of light and that of a gun shot, on the night of 22 June 1822, near Paris., Unknown Artist, (19th century) / Bridgeman Images
GIA4719668: Portrait of Cardinal Richelieu (1585-1642) carrying the cross of the Order of the Holy Spirit (Holy Spirit) - Armand Jean Du Plessis Cardinal and Duke of Richelieu (1585-1642) with a cross of the Order of the Holy Spirit - engraving - 19th century, Unknown Artist, (19th century) / Bridgeman Images