Small chalkboard with a hinged top, used in filming, that records the scene number, the take number, the sound level, and all other points pertinent to the scene being filmed. At the start of a scene, as the board is clapped, the camera shoots a close-up of it and the audio engineer holds a microphone to it to register the clapping sound. In this way, film and sound begin at the same time. Although use of a clapstick may seem to be a Hollywood affectation to people not working directly with the production, it is actually very helpful in the editing process in locating and marking the scenes to be used in the final production, and in synchronizing the sound and picture.




