Electric light by the first practical electric arc light in 1806. By the 1870s, Davy's arc lamp had been successfully commercialized, and was used to light many public spaces. The development of a steadily glowing filament suitable for interior lighting took longer, but by the early twentieth century inventors had successfully developed options, replacing the arc light with incandescents. The energy efficiency of electric lighting has increased radically since the first demonstration of arc lamps and the incandescent light bulb of the 19th century. Modern electric light sources come in a profusion of types and sizes adapted to many applications. Most modern
Royal Society of Edinburgh the foundation of the modern sciences. From the 20th century onward, the society functioned not only as a focal point for Scotland's eminent scientists, but also the arts and humanities. It still exists today and continues to promote original research in Scotland. In February 2014, Dame Jocelyn Bell Burnell was announced as the society's first female president, taking up her position in October. The Royal Society has been housed in a succession of locations: Fellowship of the Royal Society of Edinburgh is an award in its own right that entitles fellows to use of the initialism or post-nominal letters FRSE