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 Queensland Art Society the newspapers were extremely critical. The society received the Royal Warrant in 1926. Royal Queensland Art Society The Royal Queensland Art Society is an organisation for practicing artists and those who appreciate art in Queensland, Australia. It is the oldest art society in Queensland. A meeting was held in the Brisbane School of Arts on Thursday 4 August 1887 to propose the establishment of an art society in Queensland to be called the Queensland Art Society. It had nine initial members. The Queensland Premier Samuel Griffith was the inaugural president and Edgar Walker was the vice-president. Other members included artists