A clapperboard is used to synchronize audio and visual recordings made separately. It produces a distinctive precise action on both recordings that may be lined up later when editing to combine the two recordings in synchronization for playback. So likely it should be used at the beginning of any point that might need editing together at a later time. Such as the start of a particular scene of a movie.
It's called a clapboard, or a clap slate, or a clapperboard. According to Wikipedia (see the Related Link below), "Other names for the clapperboard include clapper, slate, slate board, sync slate, time slate, sticks, board, and marker."
The duration of Clapperboard - TV series - is 1500.0 seconds.
Clapperboard - TV series - was created on 1972-04-14.
Clapperboard - TV series - ended on 1982-01-01.
You may be referring to a clapboard (also called a clapper, clapperboard, clap slate, or slate board). See the Related Link below for the Wikipedia entry.
You might be talking about a clapperboard? http://en.wikipedia.org/wiki/Clapperboard
A clapperboard is used to synchronize sound and picture and to mark the takes and scenes of a particular picture. You can get more information about this at the Wikipedia. Once on the page, type "Clapperboard" into the search field at the top of the page and press enter to bring up the information.
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