Electric light be made with a screw-thread base, two metal pins, two metal caps or a bayonet cap. The three main categories of electric lights are incandescent lamps, which produce light by a filament heated white-hot by electric current, gas-discharge lamps, which produce light by means of an electric arc through a gas, and LED lamps, which produce light by a flow of electrons across a band gap in a semiconductor. Before electric lighting became common in the early 20th century, people used candles, gas lights, oil lamps, and fires. Cornish chemist Humphry Davy developed the first incandescent light in 1802, followed
Royal Society of Victoria the centre of Melbourne. Royal Society of Victoria The Royal Society of Victoria (RSV) is the oldest learned society in the state of Victoria in Australia. The Society was formed in 1854 as The Philosophical Institute of Victoria from a merger between "The Philosophical Society of Victoria" (inaugural president Captain Andrew Clarke) and "The Victorian Institute for the Advancement of Science" (inaugural president Justice Sir Redmond Barry), both founded independently earlier in 1854 and found to be serving similar aims and membership. The Philosophical Institute received Royal Charter in 1859, and the first president of the freshly renamed Royal Society