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
Journal of the Royal Statistical Society in parallel to Series A-C as a Royal Statistical Society publication in 1993, having previously been published by the Institute of Statisticians. Since 2004 the Society has published "Significance", which consists of articles on topics of statistical interest presented at a level suited to a general audience. From September 2010 "Significance" is jointly published with the American Statistical Association and distributed to members of both societies. Journal of the Royal Statistical Society The Journal of the Royal Statistical Society is a peer-reviewed scientific journal of statistics. It comprises three series and is published by Blackwell Publishing for the Royal Statistical