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 Pharmaceutical Society history, and include: Since 2002 the Society has concentrated on developing the collection of historical and contemporary proprietary medicines. The museum is open to visitors and admission is free. Guided tours are available if booked in advance. In 1983 the Royal Pharmaceutical Society of Great Britain donated over 10,000 historic specimens of materia medica, including crude drugs, herbarium sheets and slides to the Royal Botanic Gardens, Kew. This material is now housed in the Economic Botany Collection (EBC) at Kew. The museum is a member of the London Museums of Health & Medicine. The three boards provide professional leadership and