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 Antiquaries of Ireland collections of the National Museum of Ireland. The Society achieved its aim of illustration of antiquities, not only through the published "Journal", which from its creation contained both lithographs and engravings (and later photographs), but also by a comprehensive effort to photograph the antiquities of the 32 counties of Ireland. The RSAI publishes an annual peer-reviewed Journal, generally abbreviated as JRSAI. The affairs of the Society are conducted by the elected President, Officers and Council (all of whose services are voluntary). The following have served as Presidents of the Society: Royal Society of Antiquaries of Ireland The Royal Society of