Llibre Vermell de Montserrat Llibre Vermell de Montserrat The Llibre Vermell de Montserrat (, "Red Book of Montserrat") is a manuscript collection of devotional texts containing, amongst others, some late medieval songs. The 14th-century manuscript was compiled in and is still located at the monastery of Montserrat outside Barcelona in Catalonia (Spain). The manuscript was prepared in approximately 1399. It originally contained 172 double pages, of which 32 have been lost. Six folios contain music. The title "The Red Book of Montserrat" describes the red binding in which the collection was placed in the 19th century. No composer is identified for any of the
Mercury battery popular power source for portable electronic devices. Due to the content of toxic mercury and environmental concerns about its disposal, the sale of mercury batteries is now banned in many countries. Both ANSI and IEC have withdrawn their standards for mercury batteries. The mercury oxide-zinc battery system was known more than 100 years ago but did not become widely used until 1942, when Samuel Ruben developed a balanced mercury cell which was useful for military applications such as metal detectors, munitions, and walkie-talkies. The battery system had the advantages of long shelf life (to 10 years) and steady voltage output.