Richard Sigismund Karl Werdermann
1828 Born in Silesia
1870 Bought Gramme's English and American patents and exhibited the first Gramme machine in London
1875 Exhibited arc light at the Charing Cross hotel
1878 Invented a semi-incandescent lamp at his factory in the Euston Road, London
Invented the electric candle at the same time as Jablochkoff, subsequently sold him his patents
1883 A large Gramme machine was built for him in Stockport
1883 Died