Photojournalism did not emerge until effective means of photo-mechanical relief printing were developed in the 1890s. A further advance took place in 1910 when Eduard Mertens devised a rotary printing cylinder capable of printing type and illustrations together. The process was rapidly taken up by the London Illustrated News. The first newspapers to print photographic news pictures were The Daily Mirror in London, The Daily Graphic in New York and Excelsoir in Paris. The 1920s saw a large increase in the number of newspapers and magazines using photographs and in doing so, created employment for a growing number of photojournalists. The most successful example of a photojournalism was Life Magazine in the United States and Picture Post in Britain.