Fulton used this technique to show Talbot transforming into a werewolf. First he filmed the actor without makeup. Then he stopped the camera. Jack Pierce applied the first layer of makeup. Then Fulton filmed for a few more seconds. Fulton and Pierce repeated this process many times.
Fulton put all the pieces together. On screen, Talbot turned into the Wolf Man. The transformation on film took ten seconds. The actual process took about six hours!