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 Tasmania having had a continuing existence since 1843. Earlier bodies include the 1837 formation of the Tasmanian Society of Natural History by Sir John Franklin assisted by Ronald Campbell Gunn. Queen Victoria became Patron of the Botanical and Horticultural Society of Van Diemen’s Land in 1844 and the name was changed to The Royal Society of Tasmania of Van Diemen’s Land for Horticulture, Botany and the Advancement of Science. Under the current Act of Parliament, passed in 1911, the name was shortened to The Royal Society of Tasmania. On the event of the sesquicentenary of the Society in 1993 it produced