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 Geographical Society of Australasia A. A. Simpson (president 1925–1930), John Lewis (president 1913–1920) and Clive M. Hambidge (president 1944–1947). Royal Geographical Society of Australasia On 22 June 1883, the Geographical Society of Australasia started at a meeting in Sydney. A branch was formed in Victoria in the same year. In July 1885, both the Queensland and the South Australian branches started. In July 1886 the society became the Royal Geographical Society of Australasia. The New South Wales branch's new constitution in 1886 widened its scope to encourage interest in scientific, commercial, educational and historical aspects of geography. The Society sponsored several important expeditions, notably