. This allowed much longer films and opening the door for further opportunity, both financially and creatively, as well as bringing into being the double reel camera that became such an icon of movie production.
             The major advance of the 1930's was the introduction of synchronous sound and dialogue in the late 1930's. First invented and shown in the 1920's, it became the standard by the early 1930's, partly due to the invention of a device based on the radio that could effectively amplify sound in the theater. Initially there were two available systems with which to record sound. The first was similar to a phonograph, and recorded the sound to a separate disc. The second, more popular, system recorded the sound directly onto the celluloid strip.
             Initially sound hindered the filmmaking process, since the cameras had to be encased to muffle the noise of their motors and actors could not stray far from the stationary microphones. However, technological advances soon made up for this and the sound became an integral part of filmmaking. The incorporation of sound into film and the resulting movie theater draw triggered a number of mergers in Hollywood as companies tried to consolidate their power (and their wealth). The result of these unions was the creation of the first major
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