What are those black and white things dirictors for movies and such use. They have like, the scene and trial written on it.
exactly, a clapperboard is used in movies.
You are absolutely correct as to the functionality of this basic gadget. The link offered by katie_here says it all.… Now I think the clapper is just the top part, and the bottom part is the slate or slate board. The whole thing then would be a "clap board". It functions as a marker to assist in synchronizing sound with picture.