Analysis of information sources in references of the Wikipedia article "Silent film" in English language version.
synchronised sound in the silent-movie era (accomplished by playing a gramophone while manually adjusting the projector's frame rate for lip synchronisation)
synchronised sound in the silent-movie era (accomplished by playing a gramophone while manually adjusting the projector's frame rate for lip synchronisation)
synchronised sound in the silent-movie era (accomplished by playing a gramophone while manually adjusting the projector's frame rate for lip synchronisation)