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
Thomas Graves (1802–1856) died in Malta on 28 August 1856, from a wound inflicted by Maltese boatman Giuseppe Meli. Meli was later tried for Graves's murder. Thomas Graves R.N. was a Member of the Belfast Natural History Society and an Associate Royal Geographical Society. Thomas Graves (1802–1856) Thomas Graves (1802 – 28 August 1856) was an officer of the Royal Navy and naturalist who worked extensively in the Mediterranean. Thomas Graves was born in Belfast in 1802 and entered the Navy in 1816. In 1827 he was promoted to lieutenant in HMS "Adventure", under the command of Philip Parker King and surveying on