Galena diode. Making such wireless receivers was a popular home hobby in Britain and other European countries during the 1930s. Scientists associated with the investigation of the diode effect are Karl Ferdinand Braun and Jagadish Bose. In modern wireless communication systems, galena detectors have been replaced by more reliable semiconductor devices. Galena Galena, also called lead glance, is the natural mineral form of lead(II) sulfide. It is the most important ore of lead and an important source of silver. Galena is one of the most abundant and widely distributed sulfide minerals. It crystallizes in the cubic crystal system often showing octahedral
Galena, Maryland Galena, Maryland Galena is a town in Kent County, Maryland, United States. The population was 612 at the 2010 census. Galena is located at (39.341680, -75.878444). According to the United States Census Bureau, the town has a total area of , all of it land. Galena was founded in 1763 under the name Down's Cross Roads, after William Downs, a local tavern owner. The name was later changed to Georgetown Cross Roads sometime before 1813, and finally to Galena in 1858. The name comes from a supposed silver mine in the vicinity of the town, which extracted the metal from