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 Royal Society of Edinburgh or the Royal Society of London. Presidents of the Royal Society of Edinburgh have included: The Society traditionally has more than one Vice President at any given time. Vice Presidents of the Royal Society of Edinburgh have included: Royal Society of Edinburgh The Royal Society of Edinburgh is Scotland's national academy of science and letters. It is a registered charity, operating on a wholly independent and non-party-political basis and providing public benefit throughout Scotland. It was established in 1783. , it has more than 1,660 Fellows. The Society covers a broader selection of fields than the