Linda Hall Library
Science Engineering Technology

Jean-Baptiste Biot

    Jean-Baptiste Biot, a French physicist and astronomer, was born Apr. 21, 1774. In Biot’s day, the extraterrestrial origin of meteorites was a hotly-debated topic. Ernst Chladni in 1794 had first proposed the idea that meteorites come from outer...

Charles Plumier

Charles Plumier, a French botanist, was born Apr. 20, 1646. Plumier made three plant-collecting trips to Central America and the French Antilles in the 1690s, and was about to make a fourth when he died near Cadiz in 1704. He is best known to modern gardeners for his...

Gordon Moore

On April 19, 1965, the latest issue of Electronics magazine went on sale (second image).  It contained a short 4-page article by Gordon Earle Moore, called “Cramming more components onto integrated circuits”, in which Moore predicted that integrated...

August Petermann

      August Petermann, a German cartographer, was born Apr. 18, 1822. Petermann was a skilled map maker who came to Scotland in 1845 to assist the English map maker A.K. Johnston produce his atlas (Johnston had permission to translate into English the...

Giovanni Battista Riccioli

            Giovanni Battista Riccioli, an Italian astronomer, was born Apr. 17, 1598. Riccioli was a Jesuit, which means that, after the condemnation of Galileo in 1633, he was responsible for defending the Church’s position...