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 Philosophical Society of Glasgow medicine, commerce, weaving, crafts and magic, her broad portfolio covers both Arts and Humanities. The image of Minerva appearing on the medal is taken from the image carved on the President’s chair which is on permanent loan to the University of Strathclyde. Royal Philosophical Society of Glasgow The Royal Philosophical Society of Glasgow is a learned society established in 1802 ""for the improvement of the Arts and Sciences"" in the city of Glasgow, Scotland. It runs a programme of lectures, starting its 217th Series in October 2018. The Society formerly owned a building on Bath Street, but since 1994 has