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 Fellow of the Royal Society Royal Fellow of the Royal Society A Royal Fellow of the Royal Society is a member of the British Royal Family who has been elected a Fellow of the Royal Society. The council of the Royal Society recommends members of the Royal Family to be elected and then the existing Fellows vote by a secret ballot whether to accept them. The ballots have only a box to tick supporting the measure; those opposing have to write "no" or otherwise mark or spoil the paper. the Patron was Queen Elizabeth II, and Royal Fellows were: The British Monarch is always the