Up until 1903 August Lumiere thought that cinema was "an invention without a future" but Edwin Porter directed 'The life of an American fireman' with editing, August Lumiere's comments were proved wrong.
The life of an American firemen had discovered a way of creating an emotional impact on the audience. Edwin achieved this by inter cutting two different images that didn't go together, but by doing this he had made a story.
A Moviola was the original machine that was used to cut films in editing, some people said that it looked like a sewing machine on legs. On average editors would sort through 200hrs of footage for a 2 hr film.
The use of sound was introduced in cinema in the 1930's but, only in the 1940s/1950's did sound really take off with the mass industrialisation of film making.